Return the healing mace Shard of the virtuous of Karazhan

hello
With the Guild we went to Tampest Keep to try to kill Kaelthas Sunstrider. During the fight with him had to change my weapon (healing mace from Karazhan Shard of the virtuous) on legendary. After the battle, the inventory is not found my healing mace. She was just gone. disappeared as well as the legendary.

Please return the healing mace Shard of the virtuous of Karazhan.

Game master sad: unable to assist
please help

Thank you
Shaman Tukitos