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 Nature Evo Larva is needed 174 times to fully ascend all 13 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 
Nature 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 |
|---|---|---|---|
| 1-1 | Voiceless Hunters | 
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| 1-4 | Feral Alliance | 
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| 1-5 | Bramblelurk Trail | 
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| 5-1 | Crimson Woods | 
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| 5-3 | Jade Forest | 
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| 5-4 | Mystic Vale |
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| 6-2 | Dark Wood | 
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| 6-5 | Under Wood | 
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| 7-1 | Noble Village |
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| 7-2 | The Farm Lands | 
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| 7-5 | The Vanguard | 
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| 8-2 | War Front | 
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| 8-5 | Goblin Hordes |
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| 12-3 | Past the Wall | 
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| 12-4 | Check Point | 
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| 12-5 | Warrior Village | 
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| 14-1 | Flooded Camp | 
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| 14-2 | Sacred Forest |
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| 14-4 | Raiders Camp |
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| 15-5 | Marauder Arena |
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| Evo Island 1 to 5 (  Nature)
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Evergreen Island (Evo Island on Thursday) |
   
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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 |
|---|---|---|---|
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Black Diamond |  x30 x10 x9 x5 |
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Bovus El Doro | x5 x15 x5 |
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Chief NubNub |  x5 x15 x5 |
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Ekko | x30 x9 x10 x5 |
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Goretusk |  x4 x19 x17 x40 |
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Jabber Clenchjaw | x4 x12 x4 |
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Overlord Executum | x26 x9 x9 x5 |
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Phemus | x6 x17 x6 |
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Rocky the Shiitake | x5 x8 x25 x8 |
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Shadowblade | x30 x9 x9 x5 |
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Tsume | x5 x16 x5 |
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Willow Swift | x2 x5 x2 |
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Zurk | x5 x15 x5 |