Sylphsong
Description
Eva’s soul and strength reside within. Silk will regenerate while resting at a bench.
1 Interactive Map Location
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Pharloom
X: 6741 Y: 15786
Grant Eva’s final request, and bind this skill.
Unlocking it requires you to unlock a minimum of 32 Crest slots. It’s possible (but difficult) to do this prior to Act 3 by obtaining all 6 Crests available in those acts, and all 18 
Memory Lockets.
Crredit to GG user
jphoherz3 for cluing us in on the Act 2 info.
This shows as act 3 but you can get it in act 2
Thanks for the heads up! I've edited the description with credit to you.
This shows as act 3 but you can get it in act 2
Thanks for the heads up! I've edited the description with credit to you.