It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, The damage quickly reverts them out of their eel forms. The fight comes down to simply destroying as many of the tentacles as they can, hoping this will allow them to get away.
DM: All right, that ends your turn. Then it's going to use a legendary action to attempt to hit you with a tentacle. That is a 28 to hit. All right.
Player: Oh shit, 22. No. Hits me.
DM: Yep. That is--
Player: Oh, uh, hold on. Two. What's 28 to hit? Nah, wouldn't hit 28. Never mind. 'Cause I'm blessed but it's not much--
DM: 28 points of bludgeoning damage. LIAM. Okay. Uncanny Dodge? Okay, so reduce that by half, so it's 14 and you are grappled.
Player: Oh, good.
DM: As the tentacle wraps around you.
