The world's strongest exorcist is a master of Japanese magic who is betrayed by his country and killed because of his power. He reincarnates in a fantasy world where he has no magical power at all, but...
A poison harmless to humans, 
but effective against amphibians.
.سمّ لا يؤذي البشر، لكنّه فعال ضدّ السحالي
Inoffensif contre les hommes,
mais redoutable contre les amphibiens.
Un veleno che non fa nulla agli umani,
ma è efficace contro i rettili.
Um veneno inofensivo para os humanos,
mas eficaz contra lagartos.
Яд, безвредный для людей,
но опасный для ящериц.