Star of Torment

The Star of Torment is a green mana weapon to be found by the Champion in all but the first episode of Amid Evil's main quest. It launches powerful crystal shards. When powered, it shoots out bundles of these shards that scatter in the direction of nearby enemies if they get close.

Description in the in-game codex
''One of the forgotten weapons of the crystal warriors. It fires part of their very essence at foes.''

The star launches shards that are powerful enough to crucify enemies...

''Powered by souls it will fire an entire cluster and seek enemies. When it hits an enemy, nearby foes may be struck by errant shards.''