A good idea on Ragnarok is to drop one in the desert temple and block the exits with wyverns. The put on ghillie and bug repellent. If it goes aggro run over and get on a wyvern. Tamed 2 level 150s like this. Best way to easily get them. Another thing is avoid taking in open desert because if a death worm shows up you are screwed and so is your mantis. Good luck taming!!!