I mean theae guys are super useful but kinda expensive to tame

Be warned that they have a fairly long range pounce, and do good damage. Don't fight these unless you're truly prepared.

Thumbs up if you think wildcard should put a grab attack on the mantis

The best way to deal with a mantis is to use fire. Use flame throwers, fire wyverns, or oil jars.

Be careful when encountering wild Megatherium since it gains an unholy boost of rage when around bugs, so make sure your Mantis is powerful or equipped enough to handle them or skedaddle out of there!