How to entrap a creature into an extradimensional prison?

[Bardess]

I am converting the characters of a novel I like to PF1. One of them is a cleric that becomes able to use a powerful ritual or magic ability to create an extradimensional, invisible trap for a tarrasque. When the beast is deceived to enter the trap, it vanishes in another dimension forever.
Is there a way to do this in Pathfinder, or should I homebrew an occult ritual/spell/magic item "ad hoc"?

[zza ni]

Idk if it would fit in THE Tarrasque (there should only be one of them), but a sorcerer with the Harrow bloodline (or anyone with access to it's greater bloodline ability gained at level 15, like some1 with greater eldritch heritage(harrow)) can use it to trap others in the timeless extradimensional demi-plane (the time doesn't move when the caster is not in there).
so as long as he stay out, anyone Plane shifted into it is stuck out of time aka the 'Phantom Zone'.

Harrowed Home:

"Harrowed Home (Sp): At 15th level, your otherworldly connection is so strong that your subconscious cleaves off a small portion of the Harrowed Realm for use as your own private sanctuary. Your harrowed home is created the first time you use this ability, and is decorated as a garish ref lection of your personality. Thereafter, you always visit this same home. You can place a portal to your harrowed home once every 24 hours, but placing a new portal destroys the previous one, and you can not move the entrance while you are inside. As long as you are not in your harrowed home, time ceases to pass for anything and anyone still in your pocket dimension; creatures cannot move, objects do not decay, and everything remains exactly the same as you left it the last time you visited the plane. Time continues as normal whenever you are inside your harrowed home. This ability is otherwise identical to mage’s magnificent mansion."

target get a save and you need to overcome it's SR but other then that it's a flat square..

[Bardess]

Uhm. Good.
I also was thinking about Create Greater Demiplane + Permanency (Rites subdomain), or a combination of Binding (Rites subdomain) + Banishment.
A permanent Maze would be best of all, but it's not available to a cleric...

[zza ni]

i like the harrow ability since it specifically call out that time stops when the creator is out.
Anyone can try and plane shift the Tarrasque to another plane, say like the earth material plane, the problem is making sure it stay there. a plane with no time mean anyone in it has no time to act to try and leave -unless he can ignore time stops, i think a time dragon or other creatures with strong connections to the plane of time can. but 99.9% of anything else is just phased out of time if they get there.

[Bardess]

By creating a timeless demiplane, deceiving the monster into entering it, and then destroying the portal on her side, the cleric wouldn't even have to worry about the Tarrasque's SR...

[Bardess]

Secret Vault would be a GREAT way to do this too (I’d just let the vault and its occupant be lost, and there’s no saving throw or SR). But it’s an 8th-level wizard spell. Any ideas how to give it to a cleric?