Talk:Devourer/@comment-24524301-20141125143156/@comment-3974211-20141202025958

It is not retroactive - kills earned before purchasing the item will not grant stacks. However, stacks earned are kept permanently even if you sell the item - but will not increment while you do not own the item. So if you sell Devourer with 20 stacks it will have 20 stacks when you buy it back.