For now, its just for looks. I'll work on making things actually light up.
In any appropriate mission template:
(ti_before_mission_start, 0, 0, [], [
(try_for_range,":slot",0,500),
(party_set_slot,"p_fire_arrows",":slot",-1),
(end_try),]),
(0.005, 0, 0, [],[...