how to make chapel scion a regular boss

[worldly willow]

i need to make it so that the Grafted Scion boss at the Chapel of Anticipation is a regular boss. By that i mean i would like to make it so that he doesnt jump into the arena by surprise the way that he does, instead i would like the bossfight to commence like a regular one, boss fog and all.

[west tapir]

The boss is most likely playing an animation that offsets it's position offscreen then plays the animation of it jumping into the arena from that position

This is how the Corrupted Monk jumping into the arena works