Quoting Toa Blizzard The Purged ice
Well Tyrvak. Um..... he's a very difficult character to explain really. He's sort of like Makuta Teridax in he likes to sometimes aid Blizzard by giving him mass amounts of strength, but he's also evil at the same time. You'd think him insane, yet he's actually a perfectly sane evil villain. AND HE'S COMING BACK!!!!! In Blizzard version 7 coming after Christmas!