[Rant] This game's practically dead in terms of actual content.

This can be a huge problem for new players starting fresh with no character card sets because the monsters actually hurt a lot at lower levels, and if we include the global potion cooldown you mentioned (I'll assume a 30 second cooldown like Empress's) you take a few hits and then have to wait 30 seconds in a safe spot, just to fight again for another 5 seconds. This does not sound like fun. It's definitely cannot be 10x to all normal mobs, it should be at least be scaling that starts from 3x to 10x.

This is basically what training alone is like on MapleStory 2, at least for a close ranged attacker. I would rotate around the map killing mobs, and eventually after a while I would rest at the healing spot (which they have in all maps) for a minute or two. It's not that bad.