Arrow of Petty Rivalry

Upon impact, this arrow opens a rip in narrative space-time and summons the wielder’s most annoying rival — from their past, school, guild, adventuring days, or hometown. The rival appears within 30 feet and immediately starts acting like they are in charge.

• The rival is fully sapient, equally or slightly more competent than the PC, and speaks Common (plus whatever languages are needed to be smug).
• The will aid the party for the sole purpose of proving their superiority.
• They refuse to leave until they’ve been upstaged by the PC at least once.
• Lasts for 1d6 hours or until the shooter bests them at something. For each hour they remain, the shooter takes 1d4 psychic damage.