User blog comment:VillainNut/PE Proposal: King Sombra from My Little Pony: Friendship is Magic/@comment-2059440-20200217221148/@comment-2059440-20200217222245

oh totally forgot that the creators also confirmed that Nightmare Moon (the very first antagonist) would of ultimately caused the extinction of all life in Equestria had she succeeded in her goals - due to eternal night killing off all plants.. so compared to that Sombra's a petty tyrant but nowhere is it implied he was going for omnicide.