We spotted two in Act I: Heimerdinger says “The Brambleback has left the jungle,” while Singed uses Murk Wolves in his experiments. In LoL, the Brambleback (or “red buff”) causes attacks to deal burn ...
Act 1 (season 2 episodes 1-3): In episode 2, when Heimderinger is breaking into his old lab (now Jayce’s) with Ekko, he uses a code phrase Ekko doesn’t understand: “The brambleback has left ...