Irvig Senay is required to be killed to collect a piece of the heart crystal for the Legends' Quest. He attacks with melee (more specifically, slash) and can only be killed once, twice if players choose the "short" route in the quest. He is the middle level of the three warriors (the other two being San Tojalon and Ranalph Devere) that have sought after the pure water source of the Kharazi Jungle spring.
When the player initiates their first fight with him, he will say "Greetings brave warrior, destiny is upon you... Ready your weapon and defend yourself." On being defeated, he will say "You have proved yourself of the honour."