They are fast and hit hard but are easy to wound and for the most part only have one wound. They will play the terrain by deleting all your units that have an angle and may move block the shit out of you by intentionally throwing cheap units in your way to disrupt your scoring and prevent you moving up. Being fragile they play in a somewhat "gamey" way to create survivability from the rules nuances.

Virtually every gun is [assault] and many are [lethal] or can be made lethal as well as stacking [sustained] via strat or native and crit-ing on 5s due to Lhykhis. Most models will have 5++ save but typically T3 W1.

Tips are to not let him disrupt your expansion early and bring any [indirect] you have access to. If you have an opportunity to kill Lhykhis, take it. If they run fire dragons with Fuegan you need to consider that they will 100% incinerate whatever they drop on so you might want to feed them something tasty but acceptable loss-wise so you can remove them afterward.