[Rendar]

I'm just going to be quick and concise on this matter. Summons have ridiculous as hell scaling, currently. And, due to the fact that CEL determines initiative order in a weird way (though i'm pretty sure it wouldn't matter either way), they are able to just absolutely ass blast whoever is your unfortunate victim.

Critical Hit! Black-Haired Vagabond attacks Brown Haired Trainee with Rusty Blade and hits them!
Brown Haired Trainee takes 103 Slash physical damage. (Rusty Blade)
Black-Haired Vagabond's turn.
Critical Hit! Black-Haired Vagabond attacks Brown Haired Trainee with Rusty Blade and hits them!
Brown Haired Trainee takes 105 Slash physical damage. (Rusty Blade)
Brown Haired Trainee's turn. Fast Offense
Brown Haired Trainee's turn. Geist Schritt (Zwei, I think)
Brown Haired Trainee's turn. End Turn
--- ROUND 1 ---
Black-Haired Vagabond recovered 11 HP.
Black-Haired Vagabond recovered 10 FP.
Brown Haired Trainee recovered 45 HP.
Brown Haired Trainee recovered 18 FP.
Black-Haired Vagabond's turn.
Brown Haired Trainee's Geist Schritt was waiting for Black-Haired Vagabond's Absolute Death, making it miss the mark!
Black-Haired Vagabond's turn.
Critical Hit! Black-Haired Vagabond attacks Brown Haired Trainee with Rusty Blade and hits them!
Brown Haired Trainee takes 103 Slash physical damage. (Rusty Blade)
Black-Haired Vagabond's turn.
Critical Hit! Black-Haired Vagabond attacks Brown Haired Trainee with Rusty Blade and hits them!
Brown Haired Trainee takes 103 Slash physical damage. (Rusty Blade)
Brown Haired Trainee's turn.
Seiryuu's turn.
Brown Haired Trainee recovered 3 FP.
Black-Haired Vagabond takes 140 Wind magical damage. (Hunter Wind)
Black-Haired Vagabond is being hunted!
Seiryuu's turn.
Brown Haired Trainee recovered 3 FP.
Black-Haired Vagabond takes 171 Wind magical damage. (Hunter Wind)
Black-Haired Vagabond is being hunted!
Brown Haired Trainee's turn.
Chun's turn.
Black-Haired Vagabond takes 138 Fire magical damage. (Fire Jet)
Chun's turn.
Black-Haired Vagabond takes 138 Fire magical damage. (Fire Jet)
Brown Haired Trainee's turn. (Install Drowned Woman)
--- ROUND 2 ---
Brown Haired Trainee recovered 45 HP.
Brown Haired Trainee recovered 18 FP.
Black-Haired Vagabond recovered 12 HP.
Black-Haired Vagabond recovered 10 FP.
Black-Haired Vagabond takes 27 Fire physical damage.
Seiryuu's turn.
Brown Haired Trainee recovered 3 FP.
Black-Haired Vagabond takes 171 Wind magical damage. (Hunter Wind)
Black-Haired Vagabond is being hunted!
Seiryuu's turn.
Chun's turn.
Black-Haired Vagabond takes 138 Fire magical damage. (Fire Jet)
The battle has ended.

This is just one excerpt, of likely many cases where this is just.. overbearing and insane.

Fast Offense is a MAJOR contributor to this, though that might be due to it likely being bugged and not working as intended. (Have 3 youkai, only 1 is bonded, so therefore you can use 3 youkai in total and all youkai summoned get +2 momentum)... Though spirits cause issue with that as well, since 6+1 = 7 and they can STILL have double-turn insta-act youkai.

I wasn't even the one getting fucked by this character, and I know that youkai doing 580 damage in 6m is ridiculous (especially with a slow summoner, so the youkai get to insta-act right after the summoner's turn)