Weapons for Knights, Paladins and Pegasus Knights.
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Cursed weapons can only be un-equipped after having the curse removed by a priest or a high level DETOX spell. They decrease one stat and may sometimes stun the character while equipped. When a character is cursed, this icon appears in the top-left of their stats sheet
I would always recommend that even if a lance is currently better than your old spear, you should keep hold of the spear too. This way, in battle you have the option to equip either and can get in some ranged attacks if your Knights can’t quite get far enough to attack with their lances.