The first Magnus defeat in Normal Mode

There's a difference between potion cooldown and excessive potion cooldown. Anytime potion cooldown exists in MS, it's what...30 seconds to a minute? That's a tad much. The only games that can pull off minute potion cooldowns are games where the monsters don't do 50%+ of your HP in a single hit. Any time Maple has something with Potion Cooldown it becomes a game of cat and mouse for 90% of the cooldown because you don't want to die, and getting hit twice equals death on a lot of characters at big bosses.

After playing TERA for a while, I'd say that in a game where you can actually dodge or block reliably, monsters that can 1-2 shot are not that big of a deal. And endgame in TERA is full of those. I'll say again, potion cooldowns should be in MS, but only if they fix a few core mechanics with collision detection and hitboxes.