We're running Dragon Heist and the party is facing the Xanathar himself in a battle. I as the DM have decided to make this encounter a bit more fun by letting some of the spectators to play as NPCs (including the Beholder itself)
One of the high-level NPC wizards, who was helping the party in this fight, decided to cast Forcecage on the scary Beholder.
But the guy playing the Beholder (ex DM) said that this tactic wouldn't work with Xanathar, because:
- The wizard would not be able to "complete" the Forcecage spell in the first place, because the Beholder had his Antimagic Cone active, not letting the spell to complete.
- Even if Antimagic Cone was turned off at the moment of casting the Forcecage spell, the Beholder will just turn it on and will "cut a hole" in the cage so that he would be able to escape.
- Even if Beholder will be trapped waiting for the Disintegrate Ray, he still would be able to use his annoying Antimagic Cone as before, because the Antimagic Cone would easily "cut through" the cage and beyond.
- Also, the deadly Beholder Rays will work through the Forcecage because it's said that Forcecage blocks spells, but Beholder's rays are NOT "spells".
- He also mentioned that Antimagic Field is level 8 and Forcecage is level 7, Wall of Force is even lower, level 5.
I've searched for an answer on this website, but the closest what I've found is this, saying that an already "existing" Forcecage probably will not be affected by the Antimagic Field. So it's not exactly the Beholder vs Forcecage spell... Also that question was answered for DnD 3.5e...
I've shown this link to the Beholder's player but he says that the Forcecage description says "a forcecage resists dispel magic", but the Beholder's Antimagic Cone is not "Dispell Magic", so wherever the Beholder points with his Antimagic Cone, all Forcecages and Walls of Force WILL be supressed. I really don't see what's wrong with this logic 🤷.
Because of that, he said that Forcecage and Wall of Force are completely useless in an encounter with a Beholder - he'll be just suppressing them. Are they, really?