I have the apotheosis and enchanting command mod. This allows me to get enchantments at a higher level than usual. For some reason having exacly dark nock 5 on a dread bow turns it invisible exept for the red eye jewel. This is a visual bug, the bow functions the same as it normaly would. From what I can see the bow probally turns invisible in the hand, because one needs to charge it for at least 2 seconds to fire the arrows. Dark nock reduces this time by 0.4 sec each level and level 5 of it is 2 sec then. So 0 sec charge time. Thats probally why it is invisible. I think....