[Snake]

Turn order.

Hexer curses on the last round, because they're tanks and don't use CEL.
End round.
One person attacks, gets cursed.
Hexer refreshes the Fellel's Fumble and stands there like "Come @ me bruh."

Then it comes Momentum efficiency.
Each Fellel's Fumble is equal to 3M, it nullifies 4 attacks. 3 * 4 = 12 Momentum that cannot be salvaged because crits don't factor in it, you'll be missing your attacks while trying to decrease it's level.
One round and a half later...

You finally get rid of the Hex, though the Hexer have another Fellel's Fumble with your name written on it and a trollface yellow drawing instead of an arcane cursed seal.

The problem here is that they can, every 3M, use Fellel's Fumble, refreshing and keeping the curse in themselves eternally, geddit? Try fighting a Hexer with an basic-hit class like Magic Gunner or Void Assassin before making assumptions?

That, while your char is probably under Poison, Etacof Silence and Burn chipping your HP/FP down by chunks, unable to heal due to Interference, and under Fallcall due to Fear, every damn round, with zero counterplay outside 'lol let me swap to summoner and spend 1 legend ink to be vampire for SAN'.