Suggested item:

+X Longbow
Choose X based on current power level of group
Bow does Radiant Damage instead of Piercing

Special Ability - If the user dies while serving a shared purpose with the bow, the enchantment on the bow breaks allowing the Deva contained within to take physical form once again. The Deva will cast Raise Dead on the wielder at the first opportunity and remain to protect the group until the current mission is completed.

The twist is that the previous "hero" wielding the bow ended up turning his back on his faith and died faithless and alone in the Abyss. The Deva/Bow has lain for a long time without a wielder and is hoping to find a true hero who can take up it's cause once again.