The Zealoid Bastion is an Infested enemy accompanying the Zealoid Prelate introduced during the fifth episode of Nightwave: Series 2 – The Emissary. It carries Arlo's Flame, an item that is needed to remove the invincibility of enemies during the Zealoid Prelate boss fight.
- Zealoid seems to be a combination of the term zealot and -oid, a suffix meaning "resembling" or "having the likeness".
- This probably refers to the fact that Zealoid is a new kind of being with a resemblance to Zealot.
- A bastion is an institution, place, subject, or person that strongly defending or upholding particular principles, attitudes, or activities.
- The Zealoid Bastion and Zealoid Prelate share the same model.