Evos are used to ascend your Heroes. One Ascension requires few different Evos and varying amounts of each. Single colored Evos can be found in almost every dungeon and almost always appear, whereas double colored Celestial Evos (called Celestial class materials) only appear in select dungeons and have a very low chance of appearing.
The Dark Evo Larva is needed 332 times to fully ascend all 18 Heroes currently in the game that use this Evo.
You can buy this Evo for 10 gems. On the Ascension tab of the Hero's profile you can tap the Evo to see in which dungeon it is available and to buy it for gems. 
Check out the PWN Shop and Honor Shop for more daily offers! (No gems needed)
Dungeons[]
If you're lucky you can find this 
Dark Evo Larva in the following Dungeons. In campaign dungeons Celestial Evos are rare and hard to find. Some Rare Celestial Evos (those for 800 gems) are even harder to find!
Visit Evo Island to collect these rare and shy beings, Boss!
| Chapter | Dungeon Name | Token(s) | Evos |
|---|---|---|---|
| 1-3 | Catacombs of Muck | 
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| 2-3 | Empty Cages | 
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| 2-7 | Pillar of Command | 
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| 4-2 | Beastmen Village |
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| 5-5 | Shogunate Fortress | 
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| 6-6 | Necrotic Chambers | 
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| 7-4 | Elite Garrison | 
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| 9-4 | Shadow Gate | 
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| 10-2 | Torture Chambers |
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| 10-5 | Infernal Bastion | 
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| 11-4 | Summit of Power | 
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| 11-6 | Festering Halls | 
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| 12-2 | The Secret Passage |
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| 13-1 | Captive Barracks | 
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| 14-7 | Imperial Dungeon |
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| Evo Island 1 to 5 (  Dark)
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Plagued Island (Evo Island on Monday) |
     
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Combining[]
You can craft Evos in the Craft menu. This Evo cannot be obtained via combining.
Ascensions used for[]
This Evo is needed to ascend the following Heroes:
| Token | Hero | Ascension 1 | Ascension 2 |
|---|---|---|---|
|
Augustus |  x2 x10 x25 x5 |
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Balog the Loud | x4 x30 x8 x10 |
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Chief NubNub | x5 x15 x5 |
 x4 x15 x10 |
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Ella Ametryst | x15 x5 x5 |
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Kobal the Pestilent | x17 x6 x6 |
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Leonidus | x12 x28 x15 x2 |
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Mangle Jaw | x5 x15 x5 |
x15 x10 x4 |
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Overlord Executum | x26 x9 x9 x5 |
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Phemus | x6 x17 x6 |
x4 x15 x10 |
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Shadowblade | x30 x9 x9 x5 |
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Sir William | x4 x12 x4 |
x15 x4 x7 |
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Squinch | x4 x12 x4 |
x4 x15 x7 |
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Therand Fiddlestrom | x10 x5 x30 x10 |
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Torchy | x3 x10 x3 |
x15 x5 x4 |
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Tsume | x5 x16 x5 |
x15 x11 x4 |
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Yasmin Bloom | x2 x5 x2 |
x15 x4 x10 |
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Yokozuna | x8 x5 x30 x10 |
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Zurk | x5 x15 x5 |
x4 x15 x10 |