You can buy it from the tailor. In order to get materials for it raise your relationship with Selena (when you're caught up with Selena's story, she will harass you at night when you sleep and you'll wake up with dark orbs, which can be exchanged with the tailor)
Lamentations
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There are 2 ways:
1) Just brute force it. Keep spamming celestian form, until he is out of Mana. When your HP drops to 0 in celestial form you return to normal form with full HP, so you can just keep using it over and over whenever you get low in normal form.
2) If you have the succubus skills (obtained from succubus clothe set) you can equip the related skills and drain his mana to 0 at the start of the fight, then he won't be healing. Its the faster method.
I think I found a bug (android ver 0.70.007)
When fighting Elith (not the first encounter) with Violet equiped (full body suit) and we Give Up while bound, she puts us to sleep but then doesn't do anything at all and we are in the sleep state permanently, hence the game soft locks.
I tried to recreate it but was unsuccessful, mainly cuz Elith won't use the bound attack first. One thing I did notice while trying was that normally Ceriphina removes the slime suite when she drops us off to Elith, but when the bug happened she dropped us off in the slime suite.