Orsdxy

2 $begingroup$ When dealing with monsters who have resistance or vulnerability to a specific damage type, I've been having my players roll the expected damage and I'll half or double it behind the screen. I've recently found a DM who tells the players outright if the monster is resistant or vulnerable, and, given the example of vulnerability, has them roll double dice instead of doubling the damage. Should the player roll damage and the DM secretly halve or double it depending on the situation of resistance/vulnerability? Or should the DM tell the player that the monster has resistance/vulnerability and have the player roll half/double the damage dice? An example: Player Bob is playing Bob the Barbarian. He hits a (DM-controlled) Grick with his club. The Grick is resistant to non-magical bludgeoni