Take into consideration its Floating attribute and use units like Doctor Cat, Necromancer Cat and Sanzo Cat.
Considering other Enemy Awakened, it has quite low health. However, it has a fast attack that deals a decent amount of damage and creates a level 1 Shockwave.
Be careful as this enemy's shockwave can reach over 450 range, meaning Bahamut Cat can't outrange it.
Stats
Nyalladin
Health
Attack Power
Attack Range
Time between attacks
Movement Speed
Knockback
Attack Animation
900,000 HP
6,450 damage (2,976.92 DPS)
190 (Area attack)
65f
10
4 times
51f (14f backswing)
Special Ability
Attribute
Creates a lv.1 Shockwave (100%)
Floating
*In each stage, there is strength magnification, the value of health and attack power varies due to this value.