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I
Orc slayer
Snake slayer
Undead slayer
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Triple slayer weapons are quite rare, and as such do have some value to them, although generally not much unless the mods are excellent.
For instance a demon slayer, elemental slayer, undead slayer 1 handed weapon with high ssi, high mana leech, and high di would be worth alot b/c of its usefulness in doom.
Regretably the combination of slayers on yr scimitar isn't particuarly useful, even if the other mods are quite good. It is still rare to find triple slayers though, and for that the item does still have some value, although I wouldn't imagine it selling for more than a mil or two and it would probably be slow even at that rate.