What are best double swords, double axes, scythes, and halberds? Help?

[Clevar0ne]

Could use any help.  I just don't know what I don't know.

[Sky]

Halberd of Doom- dropped by Scorpia, is one of the best weapons in game. I dont have it so I dont know the stats.

SCythes - either from Issenmouthe captain (1d8 electric and cold maybe?) or from Khamul (dont have it , dont know stats)

2-blade sword: Menelvagors blade: From Imrahil in Osgiliath. Bonus feat player tool 1, +5, keen, elec 2d6, positive 2d4, on hit blindness dc-22 25%, only usable by evil/good, spot +12, vampiric regen +2

Double axe: perhaps Glacier Axe from Bolg in lonely mountain? +5, keen, dex +3, cold 7d6, massive crit 8 dmg, on hit silnce dc-22 25%, taunt +9

Someone correct me if I'm wrong

[Clevar0ne]

What does Bonus feat player tool 1 on Menelvagors Blade do?