Bandit (River Kingdoms): Stealth +1 to Stealth checks, Stealth is always a class skill for you.
Combat Expertise +/-1 Bonus to AC in exchange for an equal penalty to attack.
Darkvision (60 feet) You can see in the dark (black and white vision only).
Eidolon Link (Ex)
Fused Eidolon
Fused Link (Su)
Power Attack -1/+2
Rodent Empathy Ratfolk gain a +4 bonus on Handle Animal checks made to influence rodents.
Share Spells with Eidolon (Ex) Personal spells can be cast on your Eidolon instead.
Summon Monster I (4/day) (Sp) Use summon monster spells as spell-like abilities, with durations measured in minutes instead of rounds.
Swarming (Ex) Two ratfolk can share a square, if att the same foe while doing so he is flanked.