Nebula: Human Resistance Found
Champion size when encountered: Destroyer/Cruiser
Factions: "In Memoriam Terra" vs. Ravenous Shadow.
Tactics: this one is hard. Upgrade to whatever the anti-large-ship modules (IRE, Doom Accelerator, polarizer, plasma siege), then make runs against the RS until your shields are almost gone, retreat, repeat. It is possible to be utterly hosed by this nebula, if you don't have any upgraded anti-heavy modules. Beware.
Reward: IMT facility 100m+c/sec, 3 Cognatus, 3 Revenio, 1 Constitio. Exp based on time/enclaves escaped/starbase damage.