From Pathfinder #159: All or Nothing, which isn't enabled.

Needling Stairs

COMPLEX HAZARD 11

Stealth +20 (expert)

Description This staircase has springs in each step, which send poisoned needles shooting up through tiny holes in the wood when stepped on. Each step, 6 in total, takes up one 5-foot square.

Disable DC 33 Thievery (master) on each stair to disable its spring, or deactivate the switch in area C8 to deactivate the whole trap. Cutting the wire on the topmost stair (Disable a Device) that connects the staircase to the control switch prevents the control switch from turning the trap on or off.

AC 28; Fort +22, Ref +19

Hardness 8, HP 25 (BT 12) to break the spring under the step and make that step safe to stand on; Immunities precision, critical hits

First Step

Trigger A creature ends its movement on one of the stairs

Effect The trap makes a poisoned needle Strike against the triggering creature, then rolls initiative.

Bloody Feet

Trigger A creature moves onto an active step

Effect The trap makes a poisoned needle Strike against the triggering creature.

Melee Poisoned Needle +24, Damage 2d6+8 piercing plus 1d6 bleed plus 4d6 poison

No multiple attack penalty

Routine (1 action) The trap makes a separate poisoned needle Strike against each creature currently on an active step as 1 action. Because it is constantly jabbing needles up through any weight-bearing steps, the trap can also use its Bloody Feet free action to jab at a creature on one of the steps during that creature's turn.

Reset If deactivated via the switch, the trap can be reactivated with the switch in area C8.

Pathfinder #159: All or NothingOGL