Manbearcat
Legend
The wizard tried to use burning hands to weld the vault door shut, which I said would not work, though I let it deal half damage to the wyrmlings as they came through.
I'll let others reply to your question outlined in the initial post. I'd like to focus on this bit here. Is there a specific reason you didn't either say yes here or allow the PC to roll the dice and make p42 improv effort to weld the door shut with the fire spell? That seems to be precisely the type of thing you want to be encouraging. It fits the genre and it's quick thinking by your player. And it's fun!
If you felt it needed to be hard, all you needed do was (a) make the of-level DC for the Arcana check high. If he passes, (b) let him roll attack vs Fort vs standard, of-level NAD and boom, the metal hinges of the door are slag and it's impassable (save ends)
I recommend that approach in future circumstances.
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