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Relentless Spirit
Cleric Attack 23

Encounter ✦ divine, weapon

Melee weapon

Requirement: You must use this power with a simple weapon

Target: One creature

Attack: Strength +1 vs. AC

Hit: 4[W]+4+strength modifier damage.
Weapon: If you're wielding your weapon with both hands, you gain a +4 bonus to the damage roll.

Effect: Until the end of your next turn, you and your allies gain a +2 power bonus to attack rolls and damage rolls against the target. In addition, whenever you or one of your allies within 5 squares of you is hit or missed by an enemy’s attack, this bonus increases by 1, to a maximum bonus of +5.

Relentless Spirit is a 23rd-level Cleric encounter power.[Dr400]

It is an excellent choice, and a direct upgrade from Strength of Spirit.[Charop cleric]