This item is intended to grant the great cleave feat, but it currently grants the improved expertise feat instead. Item was found in an explorable with a randomized loot box at the end, unsure if the explorable itself is a spoiler or not but I can be more specific over PMs if needed.
(https://i.imgur.com/lH7f5YE.png)
Probably a case of an iprp_feat.2da error.