does Fountain of Necrotic Might re-roll item or modify the existing ?


Wretched_Twilight (accension raid heroic)

I have one of those with some nice mythic / reaper bonus on it.
Some of the crafting systems modify the existing items and retain mythic/reaper - (like slave lords) - and other systems remove the old item and generate a new upgraded item.

does anyone know if they heroic abbot upgrade does new item, or modify existing item ?
(I don't have an item with mythic/reaper on it that can I try upgrading as a test that I don't care to loose the item.)