Idle Heroes Celestial Island Building Costs & Priorities

Celestial island has been revamped and it has tons of cool new rewards and mechanics to improve your Idle Heroes lineup.

This guide will cover everything you need to know about buildings and statues on the Celestial Island as well as which order you should upgrade them in.

What is the Celestial Island in Idle Heroes?

Celestial Island is basically a way for you to passively gain tons of gold, diamonds and resources as well as stat boosts for your lineup.

You can spend gold and a special resource called Stone of Void to upgrade your buildings and statues in the Celestial Island to gain more rewards and boosts. You can gain stones of void by beating enemies in the Expedition mode on the island.

You can also gain Adventurers Medal’s from a special Adventure mode which can be used to upgrade stat boosting statues on the island. These stat boost function similarly to avatar frame boosts.

After you have accumulated half of the daily resources on a mine, it will stop production until you collect them. This means you should remember to visit the island at least a few times a day for maximum potential.

Celestial Island Upgrade Costs

There are tons of buildings and statues which can all be upgraded using the Stones of Void that can be received from the Expedition.

It is important to know how much materials you might need in order to build certain buildings to the highest level. With new updates the maximum level caps for the three mines have been increased from 30 to 60, which allows for higher daily earnings, but also higher costs.

The Watch Tower (Main Building)

The Watch Tower is the heart of Celestial Island and is considered as your main island level.

You will need to upgrade the tower in order to build more structures as well as gain more rewards from more difficult enemies.

The maximum level for the Watch Tower is 20, which allows you to build the maximum amount of mines and statues.

Important! You shouldn’t instantly go for the highest Watch Tower level, as it increases the expedition monster difficulties as well. If you can beat any expedition island with one or two hits (1-2 daffodils), only then should you upgrade your tower.

Watch Tower Level	Mines	Statues	Expedition Islands	Maximum Daffodils	Daffodil Recovery Time	Upgrade Cost
1	1	2	2	10	120 min	144K  13
2	1	2	2	10	116 min	208K 30
3	1	2	2	10	112 min	272K 44
4	1	2	2	10	108 min	336K 72
5	2	4	3	11	105 min	568K 118
6	2	4	3	11	102 min	856K 189
7	2	4	3	11	99 min	1.14M 268
8	2	4	3	11	96 min	1.43M 329
9	3	6	3	12	93 min	1.72M 429
10	3	6	3	12	90 min	2.51M 533
11	3	6	4	12	87 min	3.47M 620
12	4	6	4	13	84 min	4.43M 790
13	4	6	4	13	81 min	5.39M 884
14	4	6	4	13	78 min	6.35M 982
15	5	6	4	14	75 min	8.75M 1143
16	5	6	4	14	72 min	11.63M 1317
17	5	6	5	14	69 min	14.51M 1436
18	6	6	5	15	66 min	17.39M 1561
19	6	6	5	15	63 min	20.27M 1698
20	6	6	5	15	60 min

Mines (Gems, Gold, Magic Dust)

The three different mines in Celestial Island are the main ways to generate extra resources passively in Idle Heroes. They consist of Gem-, Gold- and Magic Dust mines.

The level caps for these mines have recently been increased all the way up to 60 in an update.

The price for levels ramps up significantly towards the later levels, which makes it important to prioritize what you upgrade first.

Mine Level	Gem Mine daily production	Gold Mine daily production	Magic Dust Mine daily production	Upgrade Cost
1	21	350K	130	12K  50
2	22	420K	160	18K 2
3	23	491K	190	24K 2
4	24	563K	220	30K 4
5	25	633K	250	36K 5
6	26	696K	280	42K 6
7	27	766K	310	48K 8
8	28	839K	340	54K 9
9	29	914K	370	60K 13
10	30	992K	400	66K 14
11	31	1.07M	430	93K 20
12	32	1.15M	460	120K 25
13	33	1.23M	490	147K 30
14	34	1.31M	520	174K 41
15	35	1.39M	550	201K 47
16	36	1.47M	580	228K 53
17	37	1.54M	610	255K 60
18	38	1.61M	640	282K 64
19	39	1.68M	670	309K 78
20	40	1.75M	700	336K 83
21	41	1.82M	720	426K 95
22	42	1.88M	740	516K 105
23	43	1.94M	760	606K 112
24	44	2M	780	696K 120
25	45	2.05M	800	786K 144
26	46	2.1M	820	876K 153
27	47	2.14M	840	966K 161
28	48	2.18M	860	1.06M 170
29	49	2.22M	880	1.15M 180
30	50	2.26M	900	1.24M 189
31	51	2.3M	920	1.51M 198
32	52	2.33M	940	1.78M 231
33	53	2.36M	960	2.05M 241
34	54	2.39M	980	2.32M 252
35	55	2.42M	1000	2.59M 264
36	56	2.45M	1020	2.86M 275
37	57	2.47M	1040	3.13M 286
38	58	2.5M	1060	3.4M 299
39	59	2.52M	1080	3.67M 312
40	60	2.55M	1100	3.94M 325
41	62	2.57M	1120	4.44M 340
42	64	2.6M	1140	4.94M 357
43	66	2.62M	1160	5.44M 377
44	68	2.65M	1180	5.94M 401
45	70	2.68M	1200	6.44M 430
46	72	2.7M	1220	6.94M 465
47	74	2.73M	1240	7.44M 507
48	76	2.76M	1260	7.94M 557
49	78	2.79M	1280	8.44M 616
50	80	2.81M	1300	8.94M 685
51	82	2.84M	1320	9.94M 765
52	84	2.87M	1340	10.94M 857
53	86	2.9M	1360	11.94M 962
54	88	2.93M	1380	12.94M 1,081
55	90	2.96M	1400	13.94M 1,215
56	92	2.99M	1420	14.94M 1,365
57	94	3.02M	1440	15.94M 1,532
58	96	3.05M	1460	16.94M 1,717
59	98	3.08M	1480	17.94M 1,921
60	100	3.11M	1500	18.94M 2,145

Statues (Speed, Attack, HP)

Statues are a new addition to the Celestial Island which provide various stat boosts to PvP battles, similar to avatar frames.

You can build up to 6 different statues when your Watch Tower is maxed out.

The difference with upgrading statues in comparison to mines is that they require you to spend Adventurer’s Medals instead of Stones of Void in order to level them up.

This means you need to complete the Adventure mode many times in order to get big boosts with these statues.

Statue Level	Statue of Lightning	Statue of Guardian	Statue of War	Upgrade Cost
1	+2 Speed	+1% HP	+1% ATK	50K 100
2	+4 Speed	+2% HP	+1% ATK	100K 150
3	+6 Speed	+3% HP	+2% ATK	180K 210
4	+8 Speed	+4% HP	+2% ATK	306K 280
5	+10 Speed	+5% HP	+3% ATK	490K 360
6	+12 Speed	+6% HP	+3% ATK	734K 450
7	+14 Speed	+7% HP	+4% ATK	1.03M 550
8	+16 Speed	+8% HP	+4% ATK	1.39M 660
9	+18 Speed	+9% HP	+5% ATK	1.8M 780
10	+20 Speed	+10% HP	+5% ATK	2.25M 910
11	+22 Speed	+11% HP	+6% ATK	2.7M 1050
12	+24 Speed	+12% HP	+6% ATK	3.22M 1200
13	+26 Speed	+13% HP	+7% ATK	3.79M 1360
14	+28 Speed	+14% HP	+7% ATK	4.44M 1530
15	+30 Speed	+15% HP	+8% ATK	5.15M 1710
16	+32 Speed	+16% HP	+8% ATK	5.92M 1900
17	+34 Speed	+17% HP	+9% ATK	6.78M 2100
18	+36 Speed	+18% HP	+9% ATK	7.73M 2310
19	+38 Speed	+19% HP	+10% ATK	8.77M 2530
20	+40 Speed	+20% HP	+10% ATK	9.91M 2760
21	+42 Speed	+21% HP	+11% ATK	11.14M 3000
22	+44 Speed	+22% HP	+11% ATK	12.47M 3250
23	+46 Speed	+23% HP	+12% ATK	13.9M 3510
24	+48 Speed	+24% HP	+12% ATK	15.45M 3780
25	+50 Speed	+25% HP	+13% ATK	17.13M 4060
26	+52 Speed	+26% HP	+13% ATK	18.94M 4350
27	+54 Speed	+27% HP	+14% ATK	20.89M 4650
28	+56 Speed	+28% HP	+14% ATK	22.97M 4960
29	+58 Speed	+29% HP	+15% ATK	25.26M 5280
30	+60 Speed	+30% HP	+15% ATK	27.78M 5610

Furnace

The furnace is another cool new addition to the Celestial Island which allows you to generate additional resources by using your excess Stones of Void.

The furnace has 5 levels, each of which unlocks a new resource you can buy.

The resources include hero promotion stones, magic dust, monster souls, chaos stones and most importantly space gems.

Space Gems can only be obtained from the Furnace and they grant an extra hero slot to your bag.

Space Gems are the only thing you should be buying from the Furnace, but note that you can only create a total of 200 Space Gems. Still, 200 ‘free’ hero slots is a massive upgrade, especially for free-to-play players.

Furnace Level	Unlocked Item	Production Cost	Production Time	Upgrade Cost
1	Hero Promotion Stone	100 / 300	1 hour	1M  100
2	Magic Dust	100 / 300	1 hour	5M  400
3	Monster Souls	100 / 150	1 hour	10M  1000
4	Chaos Stone	100 / 30	1 hour	15M  1500
5	Space Gem	2000 / 1	6 hours	20M  2000

Celestial Island Build Order & Upgrade Priority

Celestial Island building priority is key for faster progress and more resources. Not all mines and statues are created equal.

When it comes to building mines, the new increase to level 60 has brought the price point of maxing out mines sky high. However, this has also increased the rewards for the higher levels.

The statues are also very important if you intend to focus on PvP, but PvE focused players won’t have much to gain from them.

The difference in statue upgrades is that it is a good idea to give around 10 levels to each statue first, as the first upgrades are so cheap and will thus give a more noticeable difference. After that, focus on the priorities mentioned below.

As mentioned in the beginning, only upgrade your Watch Tower if you can beat an expedition island with one hit, as a higher Watch Tower level brings on more difficult enemies.

Mine Upgrade Priorities

Priority Order	Explanation
	The most important structures to build and upgrade first are the two gem mines. Gems are by far the most important resource in Idle Heroes and the mines are the most efficient way to generate them for free. When you have both mines at level 60, you will be able to get a total of 200 gems from them every day.
	Once you’re fully done upgrading your gem mines, your next priority should be the gold mines. You shouldn’t upgrade them all the way to level 60 until very late game as they’re expensive. However, upgrading them both to level 30 is a good middle-ground and grant you a total of 5.5M gold daily. (Only 6.2M daily if they’re both maxed, so the difference is not huge, but the cost would be.)
	The magic dust mines should be your last priority as dust is accumulated through other means like the monthly events. They also won’t be too crucial to your progress until the very late game, so make sure to max these mines last.

Statue Upgrade Priorities

Priority Order	Explanation
	Since the statues only help in PvP, the speed statues are the best to go for first. Speed helps you attack first every turn, which will undoubtedly give an advantage in battle. This is especially useful if you have crowd control heroes or heroes that buff your team.
	The attack statues are the best second option after speed, as hitting harder is always crucial. This is in some cases down to preference, as if you find yourself dying too fast, HP might be more useful. It is a good idea to pump more points into the statue which provides a buff to a majority of your best heroes. For example, if you have 3 light heroes in your lineup, boost the Holy statue first.
	The health statues are usually the last priority, but as mentioned above, it depends on your lineup. If you have a very high attack team to begin with, pumping points into these two statues can be a good idea. However, the meta changes constantly, so generally the attack statues will be the be the better choice.

As you might gather, upgrading the statues in any specific order is not too crucial and much depends on what your current team needs. Upgrading any of them will only benefit you and you shouldn’t worry too much on which order the statues are upgraded.

The mine build order is much more important to prioritize, as they will make a big difference in your progress.

Is Dismantling buildings on Celestial Island worth it?

Dismantling a building, statue or mine on Celestial Island will only give you a little more than half of the resources you spent upgrading it.

For example upgrading a gem mine to level 5 will cost a total of 120K gold and 12 stones of void, but dismantling it will only give you 72K gold and 7 stones of void back.

This difference will hit much harder at the later levels when you have spent over 100M gold and tons of stones only to receive half of it back.

This means, you should never dismantle any buildings in any case. It is just not worth it and you’re much better off trying to get that missing gold another way.

Remember, patience is key and you will have to level those buildings back up eventually, losing even more resources.