best weapons depend on your level.
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you have to go to the merchant but do not click him then you say "hi, best weapon please"
maybe the one with the mask
In my opinion it is a mithril scimitar.
The best place to get crimson Charms would be killing the high level cockroaches at the player safety dungeon.
There actually is no best weapon in my standard... But I am sure others would the think the Blade of Bliss would be. If you would give us information on your level and class, this would be a much easier question to answer.