The Drone Cage is a File:Supremacy-Purity.png Purity - Supremacy hybrid unit consisting of a single human engineer and two remote repair drones that heals your own and allied troops adjacent to them for 10HP at the beginning of a player's upkeep. This makes Drone Cages a far earlier-to-acquire form of healing for the massed troop formations that Supremacy-oriented armies specialize in. They are also useful in continued attacks on aliens with Purity-based armies that suffer from a lack of sustainability early-game. They require 1 File:20xFiraxiteBE.png Firaxite to be built. Note that the Drone Cage heal also affects units of your allies, so you can use them to assist an ally's war effort or defense!