Grohk using maelstrom can farm easy damage off of your team using Luna. Your best bet is to hide Luna behind a shield if you're capping the point with Luna. With totemic ward, he counters Luna's rush and your ult.

If Io tries to place Luna in front of herself or an ally to block incoming damage, keep attacking it. Your orbs pierce through Luna.

Both of you have long range weapons, but Strix simply deals more damage than you.

Cassie deals an additional 8% of a target's full hp with Big Game. If Raum has his full soul armor at 8k health, she does about 1320 a weapon shot for 4 seconds. That's 5 weapon shots, which is 6600 damage total, assuming she hits all of her shots.