i just need to know how many lunemara are in the swarm,
and i need tips on how to defeat them.

I can't remember how many lunemaras there were, and I highly doubt anyone kept count. =P

I looked at your party pets, and I think you should reassign points/equipment to them. I recommend reading this guide: https://www.sylestia.com/forums/?thread=11101

The main thing is to choose between strength OR intelligence for all your pets. The two can't be used together, so just pick one. So if you assign points to strength, don't add any to intelligence. Likewise, choose a proficiency tree that matches the stat you picked.

Also, you'll need better equipment for your pets (one is lacking a full set of equipment). Choose equipment that add more to the stat you've picked, instead of those that split the points equally between strength/intelligence, or between all the stats. Also, if you choose strength, look for relics that add to physical damage, and if you choose intelligence, use relics that add to magical damage.

Regarding fighting, target the enemy with the most stars first. The faster you get rid of them, the less damage your pets will receive. you can leave the 1-2 stars for later, so they'll inflict less damage on your pets, especially over the long battle, in comparison to the higher-starred enemies. Whenever the health drops below 75%, use mend if you can. That will save more elixirs for when you haven't recovered the use of mend, and your pets health is dropping.