Marvel Ultimate Alliance 3 - Odin Saves Thor and Loki Scene 

IIRC, Odin can comfortably solo Thanos even when he has all six Infinity Stones, so of course he could one-shot the Destroyer. Odin is bar-none one of the most powerful beings in all of Marvel lore. There's a reason why the "Odin-sleep" is a thing, it's there to prevent Odin from just ending an entire story-line entirely merely by showing up. This is also why the MCU killed Odin off in Thor: Ragnarok, as if they had kept Odin around, he would have had minimal difficulty dealing with Thanos in Infinity War/Endgame. Odin could easily have just shown up, wiped the floor with Thanos in mere moments, and left right before the credits began to roll. There are _very_ few Marvel characters who are strong enough that they could actually go blow-for-blow with Odin in a one-on-one fight. I believe that thus far there has only been _one_ villain who was canonically able to defeat Odin, the Mangog. Odin is strong enough that he very likely could contend with the Phoenix Force at it's strongest. And the Phoenix Force itself is so strong that even Thanos with the complete Infinity Gauntlet isn't guaranteed to win....and Thanos is an _Eternal_ of all things!

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