Bene Tleilaxu assassins of substantial skills in PK may buy a bag of caltrops from the PK training room. With these caltrops they may trap a non-safe room so that when someone enters the room they have a good chance of stumbling over the caltrops and getting a bunch lodged in thier feet.
Only non-Tleilax and PK'ers are effected by the caltrops… when they try to move, the caltrops have a chance of blocking them.
Even if they don't cause the person to be immobilized, they will take damage either way. You may only have one bag of caltrops at a time, and only one trap can be set per person at a time.
Any Tleilaxu can remove any other Tleilaxu's traps (they will also go inert if the person who uses it logs off to prevent abuse).
A person who has caltrops in his feet can remove them… slowly.
They will also wear off a person with time.
All in all, these are pretty deadly.
If you have a bag of caltrops:
drop caltrops
If you want to remove a trap:
remove caltrops
Requires: PK level 20 and you must currently be PK.