Celestial Island Guide: Basic Information and Stats

What is Celestial Island?

The Celestial Island is one of the main Idle Heroes which shouldn’t be ignored after level 30.

It is located at the top left of the main screen, right next to the Prophet Tree. All players have their own Celestial Islands.

On the Celestial Island, you can upgrade multiple buildings to get a lot of passive resources every day magic dust Magic Dust, gold Gold, gem Gems.

You can also attack the Monster Islands nearby for stone of void Stone of Voids, gold Gold, monster soul Monster Souls, gem Gems and even universal skin shard Universal Skin Shards If you are super lucky.

idle heroes celestial island

At the beginning, you start with the level 1 Watch Tower and 2 Empty Slots. stone of void Stone of Voids can be used to to upgrade buildings.

There are 2 kinds of Empty Slot:

  • Pit: For building up Mines (resource buildings), which produce magic dust gold gem over time.
  • Holy Terrace: For building up Holy Relics, which provide some specific boosts for your Island.

The whole island is controlled by a headquarter which is called the Watch Tower. By upgrading the Watch Tower, you increase the number of buildings you could have and their maximum levels, as well as increase the number of Monster Islands and their rewards.

For every 2 hours, you will receive a purple daffodils width= Purple Daffodil, which can be spent for a battle attack.

Watch Tower


Celestial Island Watch Tower

As mentioned above, the Watch Tower is the headquarter, the main building of the Celestial Island.

The level of the Watch Tower defines the size of the Island.

By upgrading the Watch Tower, you can increase the number of buildings you can build, their max level, get more nearby monster islands, better rewards and better capacity for the Purple Daffodil.

In general, the max level of your buildings = the level of the Watch Tower x 2.

Watch Tower LevelPitHoly TerraceCelestial IslandDaffodils Limit Capgold Upgrade Cost stone of void Upgrade Cost
111610144K13
211610208K30
311710272K44
412710336K72
522811568K118
622811856K189
7239111144K268
8239111432K329
93310121720K429
103410122512K533
113411123472K620
124411134432K790
134512135392K884
144512136352K982
155613148752K1143
1656131411M1317
1757141414M1436
1867141517M1561
1968151520M1698
20681515

Because the level of the monsters on those adjacent islands is based on your Watch Tower level, below is a table showing when you will face the stronger enemies and the rewards you will get from them.

Please note that the “enemies” contain both small islands and the big island, the Nest of Void.

I strongly recommend:

  • Checking the table below whenever you want to upgrade the Watch Tower to make sure your enemies will not get stronger.
  • Saving enough stone of void so that you can upgrade the Watch Tower and Holy Relics to the maximum of a level span.

For example, If your Tower level is 4, save enough Stone of Voids so that you can upgrade the Watch Tower to 7 and max out all of the damage boosting, HP boosting,… buildings. The enemy level will be still 120, the same as when the Watch Tower is at level 5.

Tower LevelEnemy LevelBoss RewardsIsland Rewards
1-47018xstone of void 20xmonster soul   54Kgold4xstone of void 5xmonster soul 12Kgold
5-7120 21xstone of void 20xmonster soul   72Kgold5xstone of void 5xmonster soul 16Kgold
8-10160 24xstone of void 28xmonster soul   90Kgold6xstone of void 7xmonster soul 20Kgold
11-1318027xstone of void 36xmonster soul 108Kgold7xstone of void 9xmonster soul 24Kgold
14-1620030xstone of void 44xmonster soul 126Kgold8xstone of void 11xmonster soul 28Kgold
17-1825033xstone of void 52xmonster soul 144Kgold9xstone of void 13xmonster soul 32Kgold
19-2030036xstone of void 60xmonster soul 162Kgold10xstone of void 15xmonster soul 36Kgold

idle heroes Nest of Void (Boss)

Expedition

The Expedition part is where you can find all of the monsters and bosses located on Celestial Island.

There is always only one Boss Island (Nest of Void) and lots of small islands nearby. They are similar to Guild Boss or Marauder, meaning you can attack it multiple times until it is destroyed.

You can attack them by using the purple daffodils width= Purple Daffodils. Each attack costs one.

Whether you have defeated them or not, It takes 8 hours for the Nest of Void Boss to respawn and 6 hours for the small islands to reset.

A Small Island only gives out the rewards after you completely defeat it. However, you can receive the rewards for every time you attack the Nest of Void.

If you are super lucky, you will receive universal skin shard Universal Skin Shards after defeating level 180+ enemies.

Tower LevelEnemy LevelBoss RewardsIsland Rewards
1-47018xstone of void 20xmonster soul   54Kgold4xstone of void 5xmonster soul 12Kgold
5-7120 21xstone of void 20xmonster soul   72Kgold5xstone of void 5xmonster soul 16Kgold
8-10160 24xstone of void 28xmonster soul   90Kgold6xstone of void 7xmonster soul 20Kgold
11-1318027xstone of void 36xmonster soul 108Kgold7xstone of void 9xmonster soul 24Kgold
14-1620030xstone of void 44xmonster soul 126Kgold8xstone of void 11xmonster soul 28Kgold
17-1825033xstone of void 52xmonster soul 144Kgold9xstone of void 13xmonster soul 32Kgold
19-2030036xstone of void 60xmonster soul 162Kgold10xstone of void 15xmonster soul 36Kgold

Nest of Void (Boss)

Currently, there are 6 bosses in total which can be randomly called. They all have different abilities and stats.

Bosscelestial island boss shadowcelestial island boss fortresscelestial island boss abysscelestial island boss forestcelestial island boss darkcelestial island boss light
Factionshadow factionfortress factionabyss factionforest factiondark factionlight faction
ClassMageMageAssassinWarriorMagePriest
AbilityReduce attackBurnHigh damageStunSkill DamageCounterattack

Mine Upgrade Priority

Gem Mine > Gold Mine > Magic Dust Mine

Resource Buildings (Mines)


There are three kinds of resource buildings and they all can be only built in the Pit.

The higher level your mine is, the more resources it can produce over time.

It always costs 12Kgold and 50gem to build a resource building at the first time.

gem mine

Gem Mine

The Gem Mine produces gem Gold over time.

You can build no more than 2 Gem Mines.

Click Here For Details

LevelCapacityMax Output Per DayGoldStone of Void
1112118K2
2112224K2
3122330K3
4122436K5
5122542K6
6132648K8
7132754K9
8142860K13
9142966K14
10153093K20
111531120K25
121632147K30
131633174K41
141734201K47
151735228K53
161836255K60
171837282K64
181938309K78
191939336K83
202040426K95
212041516K105
222142606K112
232143696K120
242244786K144
252245876K153
262346966K161
2723471056K170
2824481146K180
2924491236K189
3025501506K198
3125511776K231
3226522046K241
3326532316K252
3427542586K264
3527552856K275
3628563126K286
3728573396K298
3829583666K312
3929593951K325
403060N/AN/A
Total:38M4674

gold mine

Gold Mine

The Gold Mine produces gold Gold over time. You can build no more than 2 Gold Mines.

Click Here For Details

LevelCapacityMax Output Per DayGoldStone of Void
1172K345K18K2
2207K414K24K2
3241K483K30K3
4276K552K36K5
5311K662K42K6
6345K691K48K8
7380K760K54K9
8414K829K60K13
9449K898K66K14
10483K967K93K20
11501K1002K120K25
12518K1036K147K30
13535K1071K174K41
14552K1105K201K47
15570K1140K228K53
16587K1174K255K60
17604K1209K282K64
18622K1244K309K78
19639K1278K336K83
20656K1313K426K95
21673K1347K516K105
22691K1382K606K112
23708K1416K696K120
24725K1451K786K144
25743K1486K876K153
26760K1520K966K161
27777K1554K1056K170
28794K1588K1146K180
29812K1624K1236K189
30830K1660K1506K198
31847K1694K1776K231
32861K1722K2046K241
33878K1756K2316K252
34895K1790K2586K264
35912K1824K2856K275
36930K1860K3126K286
37947K1894K3396K298
38965K1930K3666K312
39982K1964K3951K325
40N/AN/AN/AN/A
Total:38M4674

magic dust mine

Magic Dust Mine

The Magic Dust Mine produces magic dust Magic Dust over time. You can build no more than 2 Magic Dust Mines.

Click Here For Details

LevelCapacityMax Output Per DayGoldStone of Void
15010018K2
26012024K2
37014030K3
48016036K5
59018042K6
610020048K8
711022054K9
812024060K13
913026066K14
1014028093K20
11145290120K25
12150300147K30
13155310174K41
14160320201K47
15165330228K53
16170340255K60
17175350282K64
18180360309K78
19185370336K83
20190380426K95
21195390516K105
22200400606K112
23205410696K120
24210420786K144
25215430876K153
26220440966K161
272254501056K170
282304601146K180
292354701236K189
302404801506K198
312454901776K231
322505002046K241
332555102316K252
342605202586K264
352655302856K275
362705403126K286
372755503396K298
382805603666K312
392855703951K325
40N/AN/AN/AN/A
Total:38M4674

Holy Relic Upgrade Priority

Vitality > Harvest > Tyrant > Red Moon > Swiftness

Holy Relics


There are 5 kinds of Holy Relics, which can only be built on the Holy Terraces.

Each kind grants a different boost for your Island.

The higher level they are, the more value they can boost.

It always costs 7000 gold and 30 gem to build a level 1 Holy Relic.

vitality relic

Holy Relic of Vitality

The Holy Relic of Vitality generates purple daffodils width= Purple Daffodil overtime, giving you more turns to raid the nearby monster islands.

You can only build one Holy Relic of Vitality.

Take a look at the table below to see the required time to generate speeds, capacities and upgrade costs!

Click Here For Details

LevelTotal BonusGoldStone of Void
11%10K1
22%14K1
33%17K2
44%21K3
55%24K4
66%28K4
77%31K5
88%35K7
99%38K8
1010%54K11
1111%70K14
1212%85K17
1313%101K24
1414%117K28
1515%133K31
1616%148K35
1717%164K37
1818%180K45
1919%196K48
2020%248K55
2121%301K61
2222%353K66
2323%406K70
2424%458K84
2525%511K89
2626%563K94
2727%616K99
2828%668K105
2929%721K110
3030%878K116
3131%1036K135
3232%1193K141
3333%1351K147
3434%1508K154
3535%1666K161
3636%1823K167
3737%1981K174
3838%2138K182
3939%2296K191
4040%N/AN/A
Total:22M2726

havest relic

Holy Relic of Harvest

The Holy Relic of Harvest increases the generate speed of all resources buildings (by a certain %) on the Celestial Island. Each level increases the generate speed by 1%.

You can build only one Holy Relic of Harvest.

Click Here For Details

LevelTotal BonusGoldStone of Void
11%10K1
22%14K1
33%17K2
44%21K3
55%24K4
66%28K4
77%31K5
88%35K7
99%38K8
1010%54K11
1111%70K14
1212%85K17
1313%101K24
1414%117K28
1515%133K31
1616%148K35
1717%164K37
1818%180K45
1919%196K48
2020%248K55
2121%301K61
2222%353K66
2323%406K70
2424%458K84
2525%511K89
2626%563K94
2727%616K99
2828%668K105
2929%721K110
3030%878K116
3131%1036K135
3232%1193K141
3333%1351K147
3434%1508K154
3535%1666K161
3636%1823K167
3737%1981K174
3838%2138K182
3939%2296K191
4040%N/AN/A
Total:22M2726

tyrant relic

Holy Relic of Tyrant

The Holy Relic of Tyrant boost the attack of your whole team when fighting on the Celestial Island only. Each level increases the attack power by 1%.

You can build up to 2 Holy Relic of Tyrants.

Click Here For Details

LevelTotal BonusGoldStone of Void
11%10K1
22%14K1
33%17K2
44%21K3
55%24K4
66%28K4
77%31K5
88%35K7
99%38K8
1010%54K11
1111%70K14
1212%85K17
1313%101K24
1414%117K28
1515%133K31
1616%148K35
1717%164K37
1818%180K45
1919%196K48
2020%248K55
2121%301K61
2222%353K66
2323%406K70
2424%458K84
2525%511K89
2626%563K94
2727%616K99
2828%668K105
2929%721K110
3030%878K116
3131%1036K135
3232%1193K141
3333%1351K147
3434%1508K154
3535%1666K161
3636%1823K167
3737%1981K174
3838%2138K182
3939%2296K191
4040%N/AN/A
Total:22M2726

swiftness relic

Holy Relic of Swiftness

The Holy Relic of Swiftness boost the speed of your whole team when fighting on the Celestial Island only. Each level increases Speed by 1 point.

You can build up to 2 Holy Relic of Swiftness.

Click Here For Details

LevelTotal BonusGoldStone of Void
1110K1
2214K1
3317K2
4421K3
5524K4
6628K4
7731K5
8835K7
9938K8
101054K11
111170K14
121285K17
1313101K24
1414117K28
1515133K31
1616148K35
1717164K37
1818180K45
1919196K48
2020248K55
2121301K61
2222353K66
2323406K70
2424458K84
2525511K89
2626563K94
2727616K99
2828668K105
2929721K110
3030878K116
31311036K135
32321193K141
33331351K147
34341508K154
35351666K161
36361823K167
37371981K174
38382138K182
39392296K191
4040N/AN/A
Total:22M2726

red moon relic

Holy Relic of Red Moon

Holy Relic of Red Moon boost the Health of your whole team when fighting on the Celestial Island only. Each level increases Health by 1%.

You can build up to 2 Holy Relic of Red Moon.

Click Here For Details

LevelTotal BonusGoldStone of Void
1110K1
2214K1
3317K2
4421K3
5524K4
6628K4
7731K5
8835K7
9938K8
101054K11
111170K14
121285K17
1313101K24
1414117K28
1515133K31
1616148K35
1717164K37
1818180K45
1919196K48
2020248K55
2121301K61
2222353K66
2323406K70
2424458K84
2525511K89
2626563K94
2727616K99
2828668K105
2929721K110
3030878K116
31311036K135
32321193K141
33331351K147
34341508K154
35351666K161
36361823K167
37371981K174
38382138K182
39392296K191
4040N/AN/A
Total:22M2726

Infographic

idle heroes celestial island infographic

Click on the image to get the bigger version

Celestial Island Guide: Basic Information and Stats
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