Battle Song Expertise is an bard feat, and was introduced in Dragon Magazine article Tools of Two Trades, for adventurers specializing in two weapon or implement groups.[Dr402] It is one of the feats associated with the White Lotus academy. This expertise feat gives a +1 feat bonus to attack rolls made with any weapon with which you have proficiency, and with a wand or other item designed as a bard implement. The bonus increases to +2 at 11th level and +3 at 21st level.