Iron cauldron

Lighting the invasion-themed iron cauldron (short name: cauldron) will place a firewall at every exit of a location. The cauldron takes a quarter Achaean day to refill itself (about fifteen minutes).

Pieces:

(1) The pot for an iron cauldron, level 1

(1) The oil for an iron cauldron, level 1

(1) The handle for an iron cauldron, level 1

(1) The base for an iron cauldron, level 1