A question for the BLU peeps

[Reynhart]

I mean when was the last time you managed to land doom on a boss in any game?

Lucis Ring works on the Adamantoise in XV.
Death works on a super monster that has more HP than the final boss in XIII, so it may count.
Yojimbo can kill anything in one hit in X.
The End can kill anything in one hit in VIII.
A good slot combination can kill anything in one hit in VI or VII.
RUB/Bane/Death can kill several bosses including Chaos when FF I was first released.
If you manage to manipulate the level of bosses in V, Lvl 5 Doom doesn't bother with immunities.
And I even think that Arsenic Knife can one shot Vegnagun in X-2.

And that's not counting every undead bosses that die in a single Life or Phoenix Down.