Avendar

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This spell triggers an explosion in the caster's immediate surroundings, and all connecting rooms, dealing a significant amount of damage in the current room, and a smaller but not negligible amount in the others. Mobiles which do not move from where they stand are not affected by this spell. This spell will not affect adjacent rooms blocked off by a closed door or a wall of stone, or rooms containing a wall of water. Blast immediately destroys walls of thorns.