Cruel Angel Clionel is an event enemy that appears in an exclusive stage called No Plan A.
One nightmare of a sea angel. Attacks rapidly as opposed to Cli-One, and has a chance to slow your units. Can hit between ranges 400-1200, meaning that no normal meatshields can survive, and neither can Hacker Cat. Instead, use close range cats like Crazed Titan Cat (its shockwaves help with the peons), Artist Cat or Guardian Gamereon.
In her signature stage, she forms a deadly synergy with Angelic Sleipnir, who has a range of 372 and can deal with cats that enter Angel Clionel's weak spot.
It's interesting to note that Assassinlan Pasalan, Asiluga's true form, can barely outrange Clionel (1250 to 1200). This is not a very practical cat to bring on this level, however, because of its minuscule attack damage of 5660 at level 30. However, with enough meatshielding, he can at least help slow down the powerful supports such as Angelic Gory.
This mystical being is humanity's salvation... or it's 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-ranged attacks (Can only hurt between 400-1200 range)
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.