Tar Pit Trap CR 10
Type magic; Perception DC 34; Disable Device DC 34
Trigger proximity (30 ft.); Reset 1 day
Effect target gains the tarred condition (DC 28 Reflex negates)
Tarred: Spells that target you instead affect a random target within 30 feet (no save) and have a 10% chance per caster level of triggering a random effect from the list below. The tarred condition can only be removed via dispel magic (CL 18th), heal, limited wish, miracle, or a wish. After 2d4+1 days the tarred condition alleviates itself as the substance crumbles away.
1 - Splay: targeted spell now affects all targets within 30 ft. of the original target
2 - Negate: targeted spell is negated and has no effect
3 - Damaging: targeted spell does twice the damage (in the case of spells that do not deal damage, double duration)
4 - Penetrating: targeted spell grants its caster a +10 circumstance bonus to bypass spell resistance
5 - Tricky: the saving throw DC(s) for the targeted spell are increased by +5
6 - Rebound: targeted spell also rebounds back on its caster
The Transgression affects everything in the Scorched Lands. Sometimes a portion of the tar pits in the Grave Morass become perverted, superheated into monstrous swathes of bitumen that cause magic to behave erratically. This sludge animates when a creature approaches it, coating them in a thick layer of disruptive tar.
[Submitted by Rory Toma!]