The Purifier is an upper-level enemy ship encountered fairly uncommonly.
The Purifier, along with the Brimstone, is the slowest enemy in the game, and has very limited range. However, it has a powerful flamethrower that deals very high damage to anything close to it. This enemy's weapon has the same appearance as the "Reforge" cannon tower (ironic, since its standard variant's weapon is the "Fastfire," which is far superior to the Reforge).
Its standard variant is the Brimstone.
| Fortress Destroyer Enemies
Enemies listed in parentheses () following another enemy are the elite form of that enemy. If there is no elite form listed, that means one does not exist or has not yet been added to the game..