Mari ⟨Керемет⟩ Keremet; the same word also denotes the local cult-place/spirit. Ultimately a borrowing of Arabic-via-Turkic karāmat, but fully indigenized as the adversary-deity.
Domains
underworld and water
retribution
Powers
works against the good god's creation and demands appeasement
curses and afflicts those who break ritual or commit wrong