Arcana Injection Trap

You inject a magical energy into a 5ft area and create a trap that triggers on touch.  Until the spell ends, the Wild Arcana Trap is affixed to a 5-foot square or a medium or smaller object.  Any creature within 10 ft of the affected area when a creature touches it must make a Dexterity saving throw or take 1d8 a force damage type.

If inspected before touching, a creature can discover the nature of the trap.  Triggering traps can be avoided if they are known to exist.

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8)