Thank you for the response.
To clarify, it's not that everything with explode, just that the enchantment will be released. The effect could be entirely benign or simply graphic, or this.
Party is lvl6. With a stupid CON lvl4 dwarf monk. This was meant to be somewhere between very painful and lethal. Partly to deter future mindless smashing and also to take advantage of a potentially stressful situation. The actual enemy threat was ended so the damage was recoverable.
The Paladin, who to his credit does not play his character lawful stupid, had a moment of stupid and decided that it was used by evil people so it needed to die.
The party also recently completed a trial through a temple of flame and all contain some minor amount of fire resistance.
I like the crit idea.
Thank you for your response.
I'm not entirely certain what you mean by off the reservation, or how to take it. I immediately think AWOL and want to get defensive.
You're right, there is no rule for resisting an anti-magic field, but my players are accustomed, due to conversation and understanding at outset of campaign, to rule serving narrative not subjugating it.
You may be right about miles being too severe, though the complication of separation isn't horrible. My group enjoys one on one sessions. But I will reconsider. Even at 5× the strength, the dweamor wouldn't even reach a mile.
I wanted there to be a chance of a permanent affect simply because of the player's reactions to the situation.
The description was a coruscating wall of purple flame roiling out from the sundered portal,matched in intensity only by its brevity as it folded back in on itself. The anti-magic field seeming to swallow the effects like flame pushed into vacuum. After the damage was dealt and 3 of the 4 party members failed the fort save, only the monk was left on the mill roof, alone in silence. The bodies of the slain bandits and forms of his companions vanished, scattered into the aether.
Every player at the table was standing with huge smiles. Laughs, a slow clap, and "whoooaa".
Because this was such a moment for them, I wanted a chance at some lasting effect. 1 player rolled 99 on the d100, ironically the Paladin who caused the whole thing!
Thank you for your time.