This item(Grugor's Shield Gargoyles) cannot be repaired.

PinkyPixie

This item(Grugor's Shield Gargoyles) cannot be repaired.

Use blacksmiths, carpenters, welders, and tailors to repair this item.

Not even self-repair.

McDougle

This is a known issue with no response from developers about how or why..

Yoshi

“As a temporary solution, if you really need this shield, please PM me your char name and shard and I’ll provide you with a shield transmog potion free of charge, as you can transmog the human version of this shield onto a skull shield which can be used by gargoyles, and this is repairable

apologies for the inconvenience”