Just finished grinding the Phantom Muspah for Venator bow. It took 33 hours to gather all 5 shards. Here's all the loot gathered and I'll answer any questions anyone may have about
Killing muspah - The RuneScape Wiki
Force muspah - RuneScape Monster - RuneHQ
Blood nihil pouch - The RuneScape Wiki
Bladed muspah - Bestiary :: Tip.It RuneScape Help :: The Original RuneScape Help Site!