Nebula: IMT Needs Help Again
Champion size when encountered: Cruiser
Factions IMT + Neinzul Mourners vs. Citadal Ascendant + Dark Spire
Tactics: focus on one enemy, then the other. Ideally, take out the DS large base before the small ones (only if you have the appropriate modules). This will take a while.
Reward: IMT and Neinzul Facilities. Exp based on time/starbase damage.