Abilities that work better (not required, but work better with RR).
Locks: Deathcoil, fear, howl of terror.
DKs: Deathgrip, Chains of Ice, Rune Tap
Hunters: Freezing trap, Scare Beast, Intimidate
Pallies: Repentance, Hammer of Justice, Lay of Hands, Flash Heal or Holy Light

ALL groups: Gift of the Naaru