Oh I fiddled with this boss in General, it is easier to do in afterbirth + version but I tried it and he removed the fire because the boss rarely turns into itself and attacks but then I gave him the tears of Isaac, and the enormous damage and still hold down the attack button and the artifact itself should be recharged if it does not work means it only works on my version of Isaac, I gave him a dumb expression from the artifact DEAD DOVE and so the artifacts that I mind gave:Immaculate Conception, Lil Loki, Lil Gurdy, Lil' Haunt, Little C. H. A. D., Little Gish, Little Steven, Transcendence, Dead Dove, Polyphemus attention to first open all the artifacts well enjoy