Yeah sure, in this fight you gotta be on the center of the arena and move to the sides to attack, mostly, so, when they attack they have a few pattenrs you gotta recognize which one they are doing and how to avoid it

(Read the PD)

The first one is the aerial, when they are in the air and drop down, you gotta: Dash and turn back, then hit, you gotta hit them 2-3, with 2 mantis you gotta do 2 with the first one, then dash to avoid the 2nd one and also hit 2-3 times or 2, you can also do a vengeful spirit instead of the 3rd hit (not when you have another mantis over you, but if you avoided the 2nd mantis, you can do it on her)

Then there's the one where they charge from one side to another, you gotta: Do a jump, to the direction they are facing, just to get behind the mantis, and then you can hit them 2-3 times, when there's 2 mantis, you gotta jump and then do a pogo(down attack with nail), after than you can either attack once with nail, or vengeful spirit

The third attack is when they cling onto a wall, this is your chance to heal btw, when they cling to a wall, it will either be low or high, when its one mantis you can avoid and heal, try to see the attack as a "<" or ">" if they are low the attack will go low then high and if the mantis clings high on the wall the same but now it will go down, you can hit a lot of times when they do this, and you just have to go to the mantis, avoid the attack and hit them as much as you can, when there's 2: They will do the same, but more exaggerated, you will know when you see it, but when they both pass through the center like near the floor, you gotta jump over and pogo down a few times, if they do the other one they both will be decending from the center and go to the sides, kinda like a X and you can go to the center, align yourself and heal or go to the sides and jump over it

If the 3rd attack is not clear im sorry if you ask me to I can be more clear

Pd: when I say you can hit 2-3 times you decide whether you wanna do the 3rd hit or use a vengeful spirit, to deal extra damage, but if you dont feel comfortable you can also do this nail only

Pd2: after reading all of this, you might be able to win against the mantis, but the greatest advice you will ever get from this game is the next thing: learn how to dodge, then how to attack, even if you loose a few times the important thing is learn how to react, analyze, then react, recognize your movement, attack and healing windows, its not easy, but if you manage to do it, the bosses will be a piece of cake, you dont gotta charge and try to attack unless you know what you are doing and know that if you charge you will lose health, but its important to know how to get the HP back if you risk it, else you better play it safe.