Spoiler alert. (To get the full effects, you really should specialise in maelstrom, put the 4 points in chill, one point in tsunami, read the description, then stack maelstrom to full stacks the first time)
Have you done that? If yes: Now tell me that’s not a joke the devs are playing on us.
If no, I’ll explain why it tickled my funnybone: The Tsunami skill, named after a wave that crosses oceans, is a whiffle of blue puff with less AOE than an auto attack. You’d be hard pressed to fill a cup of water with that thing, let alone kill an enemy.