Simplicity over complexity, time to change.

[Tupsi]

If you did him straight up he DID have a script btw..and phases...

It's just like Ozma in FFIX, everything has a script in the sense there's a monster script to tell the monster to actually work, if that's what you mean - As the only thing scripted about him as this is the particular example is that he's scripted to use Dark Star x amount of times when he chooses to use it, which is t random. Since you mentioned phases, like Provenance Watcher, Shinryu's phases were based on his wing position (PW was based on wing count) which changed up how they were. Scripted encounters doesn't necessarily change much since if you break said script, strange things happen..

Even popping your god mode tonic doesn't work 100% of the time, it can still kill you if you're not careful because you can easily waste those 3 minutes. One of the Hunt monsters follows the same principles and so many people wiped because they're not used to something other than sit and spam your spam rotation.