Hi! I'm currently sitting in the Lost Grove and (spoiler warning?) waiting to beat up the Behemoth, and I'd like some pointers to improve my battle party further. I've already heard to level up to 70 before confronting him again, and vinethorn gear would definitely help. However, I don't have the funds to buy them off the broker, so I go beat up Nameds when they deign to spawn in the hopes that I get something helpful.
My tank is Thorne (Earth attunement), my cannon is Eva (Wind attunement) and my healer is Tianavide (Light attunement).
Thanks in advance!

You might want to switch your Light pet's stats (check gear and proficiencies) from Agility to Intelligence or Dexterity, as Dexterity gives you more of a chance to crit, and hence have more healing power.

hm, well, most people, I think, go with Dex over Agi on light pets, because the crits get you better heals.
Our own two main light pets are prof in Int and Dex, with a combo of Int/Dex and Int/Agi (which gives enough speed to move before opponents)

For Eva, you'll perhaps want to swap at least one of her prof points over to dex- Bleeding debuff is inflicted when Slash attack gets a critical.

Thorne should be okay, and you could equip her with either Warden or Tidal Lord vinethorns (Warden being Agi>Str>Int>Dex, Tidal Lord being Str>Agi>Dex>Int) (as we have with our Earth tank)

Thank you both! I'll definitely take those into consideration.