In No Plan A, she forms a deadly synergy with Angelic Sleipnir, who has a range of 372 and can deal with cats that enter Clionel's weak spot.
It's interesting to note that Assassinlan Pasalan, Asiluga's True Form, can barely outrange Clionel (1250 to 1200). Despite its minuscule attack damage of 5660 at level 30, he can at least help slow down the powerful supports such as Angelic Gory, given the player brings along sufficient meatshields.
This mystical being is humanity's salvation... or it's [sic] destruction. But for now, it's too busy being an overprotective single parent who protects its kid with ultra long range attacks.
Descending from the heavens to judge this decayed world, this is the Beginning and the End. A doting monster parent to be feared. Attacks with incredible range, allowing strikes to slip through to the rear lines...
Cruel Angel Clionel (Angel)
Time between attacks
600 (Area Attack)
Might slow down Cats' movement for 120f (30%);
Long Distance (Effective range: 400~1200)
Quite literally a sea angel, a creature known for its grace, beauty and horror.
The Japanese description is a huge reference to Neon Genesis Evangelion, specifically incorporating the wordplay from Episode 24: 「最後のシ者」 The Beginning and the End. The specific borrowed term can be read in three different ways, either as envoy, casualty or on the water's edge. Presumably this enemy is all three at once.