Biting volley, ranger level 7 encounter has 2 attacks and crits on 18-20
Mage's weapon to expend arcane encounter power(attack and utility) to refresh martial encounter power of equal or lesser level so you can get these martial crit powers often.
Level 22 cleric utility of abjure the chosen gives a close burst 5 speed +2, attack +2, dam +2, and all allies crit on 18-20 until end of cleric's next turn and this is an encounter power too.
