Erevan's Gnomish Blade

A clanking magical blade materialises in the caster's hand, with a yew handle and a large cog at the intersection between blade and handle. This sword counts as a +2 scimitar with three charges per summon. Each charge can be used either to deal 1d6 extra force damage, or to cast a random  cantrip from either the bard or warlock spell list. 2 charges can be expended to cast a first-level bardic spell.