Heyo, This will be a new skilling outfit as part of next weeks Grim Harvest promo, the intention is that the pieces will be added into a in game system in the foreseeable future (where exactly hasn't be locked in stone). Suggestions are welcome as I am happy to pass em along to the team.
Benefits are 1% Necromancy experience per piece (6% total)
Head addon is
5% chance to save a focus object per ritual
Spawn 1 deathshead moth per day
5 buckets of slime
(there are some nuance to this but this is the rough idea)