As an addition to that, if it does just drain them, give them a lengthy recovery period and they can move again if this is a more persistent environment.

Not sure if these have been mentioned but here goes: 1. Sacred Flame of Hospitality - Basically a campfire or a lit torch, the flame is infused with holy magic and will repel or attack any hostile beings in its radius. Useful for plopping down in an area so you can rest. Weak enemies are repelled, medium enemies are prevented from attacking, powerful enemies who stay hostile are attacked by the flame (which is extinguished in the process). The sacred flame might even attack or inhibit the player when they are in the radius. The sacred hospitality flame basically enforces that an area is safe from hostility. Anyone who enters either can't attack or gets burned if they cause trouble. May also repel toxins, cold, disease, or darkness. 2. Flame Bellows - Air based magic, sends a burst of hyper-oxygenated air which heavily damages any enemy currently on fire. 3. Overcook Food - A cooking spell that instantly converts any raw food item into "edible charcoal" or some other foodlike item.

• Magma skin - targets skin gets mushy and porous as it turns into lava/melted metall. Can resist blunt/piercing type of damage but more vulnerable to cold and shockwave types of damage (wind is blowing the lava away).
• Heatwave - a wave of very hot air is bursting out from the caster, making all sensitive units/enemies sweat and get dizzy for a while.
• Stream of Ash - during volcanic eruptions the biggest killer is not the stones and lava - its the hot mud that moves very quickly.
• Storm of Ash - remember the huffpuff about the icelandic volcanoe and its ash? A storm with ash that makes it hard to see and move could be interesting (perhaps)
• Soften ground - make ground melt into a pool of lava or similar. Players moving through will slow and hurt their feet.
• Summon burning skeleton - a burning skeleton on fire with a weapon. Perhaps it is pregnant with a lava belly and suicide attacks?