I got hit with an argument from one of my players the other day, and it goes like this:
He is playing a Monk and his unarmed attacks count as magical attacks. He was trying to punch a Web. I told him his bludgeoning attacks did no damage since it was immune to bludgeoning damage. My party disagreed with me, on the basis that his unarmed attacks are magical.
My question to this group is… In cases like fighting a werewolf it says 'resistance bludgeoning from non-magical attacks' but other creatures in the game it just say it is 'resistant to bludgeoning'.
Do magical weapons and attacks cancel out the resistance if it does not specifically say so?
Or
Are these creatures resistance or immune to that damage type regardless of the weapon used?
Best Answer
Webs are immune to Bludgeoning Damage, Magical or not
The statblock for Webs found in the Dungeon Master's Guide doesn't qualify the damage immunity as non-magical:
Normally, when damage immunity is meant to be qualified against whether the damage is magical or not, the statblock will expressly say so, like with this devil I pulled out of Mordenkainen's Tome of Foes:
Because this qualifier doesn't appear for webs, then the monk's damage being magical doesn't matter; they do not deal damage using their unarmed strikes.
Bear in mind that, at least for basic webs, it's possible for creatures to break out of them with a relatively easy Strength or Dexterity check. So if the monk were themselves trapped, I would encourage them to just break free with what should be a relatively good Dexterity score.
Alternately, tell them to keep a Sickle (a valid Monk weapon) on hand in the future, since they'll be allowed to use their Monk damage when using the Sickle.