The ancient warriors' equipment patch is a reward from Bounty Hunter. It can be purchased for 4,000 Bounty Hunter points from the Bounty Hunter & Deathmatch Reward Shop.
It can be used on any of the Ancient Warriors' equipment to upgrade it to a superior version, which is tier 88 instead of 78, and can also be augmented. The upgrade process is irreversible, and the superior item cannot be traded. Using it to upgrade Morrigan's ranged weapons requires 100 of the respective weapon.
It must be used on an unused piece of equipment or weaponry.