I know this works on bows that drop in Juka Lord's loot:
You need a gm fletcher, and a gear (from tinkers) for each bow. Double left click the bow with a gear in your backpack and get a cursor, click on the gear, and it converts the bow to a slayer (and it turns black). I dont believe you can get a super slayer, but in the old days there was a bug where one of these can be converted twice.
Thats why u might see some old black bows with 2 different slayers on it. And if u were really lucky, u had a demon slayer and any sort of elemental slayer, because that one does 150% additional damage to Dark Fathers (vs a demon slayer doing 100% additional damage).
I dont know if the rare bows still work, but I still have 2 of those in the bank, so the next time I go there with an archer I will test it.
Course these days 150% additional damage on a dark father doesnt help much when it has 10 gazillion hit points
Just thought I would post this in case anyone ever wanted to play around with Juka Lords. They are a good source of bandages and arrows (asbout 50-60 per dead Juka Lord).
Plus, it's fun to hear a creature tell me "KingDavid I will destroy your forces" or some such phrases (I remember laughing the first time I read that).
KD