A cannon KO’s a 150 with one shot, but make sure you only hit the center shell or else you only do damage and no torpor. A catapult works on low levels but it deals too much damage and not enough torpor for a high level, and a cannon kills very low levels instantly so use catapults for low levels or cannons for high levels.
Tranq Arrows/Darts DO NOT WORK!!! To knock this out you need to use a catapult and shoot in only on it's back. If you shoot it on it's legs it will kill it. UP-VOTE SO EVERYONE KNOWS & TO GET DODODEX TO ADD THIS!!!