Elemental Trap Sigil

You create a magical sigil that remains invisible to the naked eye, set to explode with elemental energy when triggered. The sigil can be placed on any solid surface (floor, wall, door, chest, etc.) within reach.

Choose one damage type when casting: Fire, Cold, Acid, or Lightning.

You also choose a trigger condition, such as:

• A creature touching or stepping on the surface
• An object being opened, moved, or read
• A specific creature type or alignment entering within 5 feet
• A verbal phrase or spell being cast nearby

When triggered, the sigil erupts in a 10-foot radius explosion, centered on the glyph. All creatures in that area must make a Dexterity saving throw or take damage of the chosen type.

Damage: 6d8 of the chosen type (Fire, Cold, Acid, or Lightning)

Save: Dexterity saving throw, DC = your spell save DC

Success: Half damage

The glyph then disappears, leaving behind scorch marks, frost, corrosion, or char depending on the damage type.