Hi there !
Here a quick and easy guide on how to solo Corporeal Beast AKA Corp
First You need to talk to Ariane and Select Bossing Location, More and finally Corporeal Beast.
You'll enter a area next that's looks like a bridge of stone, you enter in by clicking enter the encounter and then the fight starts !
I'll suggest a full inventory of sharks and few prayers pots in you want to do more than 2-3 runs without missing prayer points
Once you reach an average of 30-40% of his life, he'll spawn a Dark Energy Core and this thing will fly next to you to steal you life and give if to Corp, The strat I suggest there is to move vertically and never let the core stay close to you.
To finish this quick guide, i'll suggest melee with a zamorakian spear or chaotic spear to finish him quickly
Hope this will be useful, Have a fun time in GangScape !