I am hunting D key and using nature peace and he still corps explosion on me ? anyone help

I believe it doesn't redeem all the corpses at once but gradually and Nihlatahak probably is casting CE faster than you do the Slain Monsters R.i.P. thing.

Only works for monster you kill

If minions get killed by merc or explode themself bodies can be used for CE.

You can try remove merc weapon

Also, if ur a trapsin, then traps are minions. So wont work with those, or summons etc either.

use tyraels might on merc