Fountain of Necrotic Might

Overview
Recent Update: Raid loot acquired prior to the release of Update 12 can be upgraded by inserting the item and 5 Shreds of Tapestry into the Fountain.


 * Introduced in Update 12, it is now possible to upgrade named treasure from Ascension Chamber raid.
 * Gather Seals of the Black Abbot from playing Hard or Elite difficulty.
 * Place the seals and the named items in the Fountain to upgrade the named item to a more powerful form.
 * You can preview the available upgrades by visiting the fountain and clicking the list interface.
 * Most existing items can be changed into the Update 12 upgradeable versions by inserting the item and 5 Shreds of Tapestry into the Fountain.'''
 * Be warned not all "upgradeable" loot are neccesarily an upgrade from the pre Update 12 versions. Review the stats of the old versus new versions in the Ascension Chamber loot history page to be sure you wish to get the new version before you do so.
 * Several items still cannot be changed into the new verisons - every item that is Exclusive due to a bug.

Fountain of Necrotic Might
Used to upgrade items obtain from Ascension Chamber, by combining them with a Seal of the Black Abbot.
 * Location: Upper Necropolis.

Seal of the Black Abbot

 * Can be obtain on ✅ difficulty from the Ascension Chamber warded chest.
 * Seals can be place in the ingredients bag.
 * The seal is Bound to Account.

Fountain of Necrotic Might Upgrades
For reference on the pre-U12 stats, see Ascension Chamber loot history. Note: Upgrading the Quiver of Alacrity will destroy any arrows/bolts it contains at the time (ref). This definitely happens for upgrading from the old version to the upgradeable base version, but upgrading from the upgradeable base version to the Striding version is unknown.
 * For all items with clicky charges except the Litany of the Dead and Purging the Pantheon, the altar claims the items gain more charges than they actually gain (the amount of extra charges you don't get is equal to the base amount). This is likely just a display error, but could be intended that they do gain these charges. Either way, its a bug.