It's a fantasy role-playing game.

DM: You are Mollymauk Tealeaf, a tiefling blood hunter . You are the member of the famous group of adventurers. Previously, Wary of its toxins, they all stay out of melee range. When the troll gets to its feet, it moves closer to Beau and Yasha, hitting them both with its poison spray and poisoning Yasha, but she shrugs it off at the end of her turn.
DM: No. It's real angry at him because it just got Hexed, Blasted, and then Bolted. It's going to bypass the shiny swords right there.
Player: Does it get close enough for me to take a swing?
DM: It does.
Player: Swing, swing. I just get two attacks, right?
DM: You were holding your action, so you get two attacks, yeah.
Player: Actually, I'm going to use the good sword. It doesn't matter. That's awful, and that's pretty good. That's 11, that misses, and 19, that hits.
DM: That does hit.
Player: That's 1d6 plus 1d4. 2d6 now, that's right. That's not bad. That's ten points of damage.
DM: Ten points of damage, as you strike it with one blade and miss with another. Immediately, as you strike across it with your blade, the venom splashes into your face. You suffer 13 points of poison damage, and then it moves out of your combat range. You can still take your reaction if you wanted to.
Player: I will take my reaction. 13 points of damage?
DM: Yep.
