AD&D Monster Spotlight: Shadow Demon
This thing is built to punish parties that live on torchlight. Its armor class changes with light. It throws down magical darkness. It panics the room with fear. When there is a vessel handy, it tries Magic Jar and turns your strength against you.
Run it like a hunter. Open with darkness. Scatter the weak with fear. Target light sources and casters. If the party raises bright light, the demon slides away and looks for a better angle. Keep the light tiers clear and the ruling consistent. Start-of-round checks only.
Give it places to move. Choir lofts, rafters, wells, and alleys. When the players finally corner it with steady light and magic steel, the kill feels earned.
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