The End Of The Terror

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Spears of blinding celestial light, swords made of divine spirit frost, and drills made of rainbow divine barriers constantly pierced the chimera's amorphous body.

Alongside them, there was Goldie and Silver, who were constantly conjuring their strongest magic to weaken the chimera as much as they could. 

Its HP was pummeling down rapidly, but there was something that was constantly forcing its HP to recover, and it was the strange forces of the portal it conjured.

This is the reason I asked Angelina, Nieve, and Brisingra to concentrate 100% on attacking it with long-ranged attacks so they wouldn't risk their lives.

Like this, they deal constant damage and make it so its regeneration cannot ever let it recover its HP to 100%

And the following step was…

Gandalf's help!