heresy
/ˈhɛrɪsi/
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noun
noun: heresy; plural noun: heresies
belief or opinion contrary to orthodox religious (especially Christian) doctrine.
"Huss was burned for heresy"
Arbistar, Sir Dawn, Unknown Diamond creature I can’t find a name for and Mr. Dusk were best friends rather than being related, yet Arbi’s son Hex sometimes calls Dusk and Dawn “uncle”. (He also sometimes calls them gramps or “старый мяч”)