It's a fantasy role-playing game.

DM: You are Keyleth, a half-elf druid . You are the member of the famous group of adventurers. Previously, Grog muscles a way through them, into what seems to be an ancient, emptied-out vault. Inside the vault, they are attacked by undead trolls.
DM: Yeah, no, that won't hit anything but himself and the surrounding chamber. Go ahead and roll damage on that.
Player: (counting) Can I get two more d6s from you?
DM: You're doing a standard 8d6?
Player: It's out of my staff. I can't do any more, right? Reroll, yep. (singing) Like a d6, like a like a d6! (counting) 35 damage.
DM: 35 damage. All righty. (explosion) The explosion hits and bursts around. The flames burn, and you can see some flames are catching on the troll. (monster noises). Still alive.
Player: Okay, I'm going to take my bonus action to do something I've never done before. I'm going to trace, from my staff, and pull out a flame blade. (shing)
DM: Okay! So you guys watch as Keyleth puts her fingers across the top of the staff. Where her fingers arc around, it creates this arc of fire, and when she stops she grabs on to a hilt that didn't exist, but now does, in her hand. That arc of flame that stayed suddenly solidifies into a scimitar-like blade that's in her hand.
