Damage that the rats hit you for:
Amarr Empire: 50% Em, 50% Thermal
Angel: 70% Explosive, 20% Kinetic, 10% EM
Blood Raider: 50% EM, 50% Thermal
Caldari State: 50% Kinetic, 50% Thermal
EoM: 75% Kinetic, 25% Thermal
Gallente Federation: 50% Kinetic, 40% Thermal, 10% EM
Gurista: 75% Kinetic, 25% Thermal
Mercenaries: 50% Thermal, 30% Kinetic, 10% Explosive, 10% EM
Minmatar Republic: 50% Explosive, 20% EM, 20% Kinetic, 10% Thermal

Anomalies are ranked in difficulty by 10 levels, these are:
(Faction) Burrow / Drone Collection (lowest)
(Faction) Hideaway / Drone Cluster
(Faction) Refuge / Drone Gathering
(Faction) Den / Drone Gathering
(Faction) Yard / Drone Surveillance
(Faction) Rally Point / Drone Menagerie
(Faction) Port / Drone Herd
(Faction) Hub / Drone Squad
(Faction) Haven / Drone Patrol
(Faction) Sanctum / Drone Horde (hardest)

A particular anomaly may be further sub-divided into 3 more categories:
Hidden Hub (easiest)
Forsaken Hub
Forlorn Hub (hardest)