Look megatheriam sorry if I spelt it wrong , are so good at killing death worms but have to live near a desert or fly it to the desert wyverns work just as well with no casualties but thunder wyverns are better mine killed a death worm in one blast it deals 546 damage per tick if you just get on it is likely not to do more than 100 damage per tick but that alone in total is like 3000 damge tip mine hatched from a level 280 egg get stronger eggs