Difference yellow X blue outline of Elite enemies?

[Coach Gamer]

Does anybody know the difference?

I thought yellow meant they drop money when killed, and blue drop abilities, but it I've seen the opposite happening. Tried googling, but couldn't find the answer.

Thanks!

[Moldredd]

I believe blue are normal elites which are just upgraded versions of normal enemies and yellow ones are agony exclusive champion version of elites, with different/random modifiers.

Elites tend to drop a scrolls while champion rewards tend to be completely random.

[🌺💗Tazzamorous💗🌺]

Blue outline = Elites
They always spawn the same elite, at the same time, on each level.
They always drop some gold and a scroll of mastery.

Yellow outline = Champions
They always spawn at the same time on each level, but the champion is random.
They have random loot and random modifiers.
You can read more about champions here:
https://steamcommunity.com/app/2218750/discussions/5/4297068922554925133/

Aside from their loot, the only impact this will have on your gameplay is if you are using an item that interacts with "Elites" or "Champions" e.g. Fighter's Headband.