BKB (Black King Bar)

A 4,050-gold item granting 9–5 seconds of magic immunity — standard in professional matches.

Black King Bar (4,050 gold) grants Avatar status when activated — immunity to magic damage and most disabling spells for 9 seconds, decreasing by 1 second per use (minimum 5 seconds). Carries build BKB to survive crowd control in teamfights. "BKB out" signals a window to chain-disable an enemy carry.