Part 1: Complete Temporal Disjunction

Oh boy here we go

Here’s a conundrum; you want to end all of reality, but lack sufficient enough spells to do so. Well, with TIME STOP, we can do just that! Here’s the set up.

Create a glyph of time stop. This is the hardest part of the set up, because time stop is a 9th level spell and requires us to have another 9th level slot for the glyph as well. We should be able to do this with a scroll of time stop and a 9th level slot. Acheiving 2 9th level slots naturally is also feasible through road to 2400 or the boon of high magic.

Nystul a rock into a creature of some type; we’ll say ooze.

Take your Crobject [Creature/Object], set your glyph of time stop to trigger upon touching an ooze, and throw the rock onto it.

> You briefly stop the flow of time for everyone but yourself. No time passes for other creatures, while you take 1d4 + 1 turns in a row, during which you can use actions and move as normal.

Note, that a rock does not take turns.

This means that time stops everywhere, all at once, for everything except for the rock, and stays stopped until the rock takes 1d4+1 turns, I.E. never.

This fundamentally stops all of reality for the entire multiverse.

There’s also a fairly easy nystulless verstion: Make a tiny servant out of the same rock, have it use timestop, then step on a glyph of timestop. Set up the spell so that it runs out 6 seconds after the tiny servant steps on the glyph, making it disapear, and unable to take the rest of its turns, leaving timestop on forever. Another option is to make it cast imprisonment on itself, locking itself away and being unable to take turns forever.

Part 2: Living in a Timeless World

Hope is not entirely lost on the world. those who have wished themselves immune to the timestop spell, and those who happened to be within an anti-magic area, could in fact continue to exist for some time, however, wish immunity lasts for 8 hours, anti-magic field for one hour. Unless you can somehow end the spell via dispel magic in this time, you need to cast it again. This obviously has a huge resource drain and, very ironically, puts us in a race against time to find and dispel the glyph. Although, who is to say 8 hours has passed when time is stopped for all creatures? Here we’re going to assume time is real.

Using various divination techniques, it may or may not be possible to dispel the glyph, depending on how well set up the original caster was when they created it; if it’s in a locked private demiplane with a private sanctum spell or in the rope trick dimension; good luck.

If you, for some reason, have access to infinite wish spells, it’s hypothetically possible to live forever in the timestopped world. This might be the final goal of the caster who set up this doomsday in the first place; becoming entirely immortal with nothing to stop them in a world that is frozen forever.

The only other theoretical alternative to adventures finding and dispelling the glyph is that a diety who is immune to timestop comes and personally deals with it; this means the original caster has pissed off Primus or the likes. With this being entirely DM-fiat, it’s not really a ‘solution’ properly.

Part 2.5: Helmed Horror

If you happen to avoid the initial cataclysm and have a true poly spell ready, you could true polymorph yourself into a helmed horror. Helmed horrors are immune to three spells as picked by their creator, one of which can be time stop.

Better yet, make a helmed horror out of something else, and magic jar it to retain your spells.

This is likely the best chance we have at actually stopping the end of the universe; I suggest creating a small army of helmed horrors immune to timestop in advance, nystuling them into humanoids, and being ready with your jar.

Part 3: Wish beyond Time

Given that wish immunity can effect “up to ten creatures you can see”, as long as you can see the creatures you can wish them immune to the effects of timestop

Using this and some spell programming, We can create a system that, upon the activation of a time stop spell, instantly wishes us immune to time stop. for this, we can create a helmed horror, and give it access to scrying on us at all times [Anything from force-shaped arcane eyes to simple scrying scrolls would theoretically work if you have enough], and access to a way to cast wish [Glyphs, Rings, Scrolls]. a magic mouth can be set to detect a time stop, which our Zodar can react to accordingly by casting wish immunity on us and up to 9 allies. We can set more than one of these to react to more than one time stop even, effectively making us immune to the end times; though the rest of the world still freezes forever until we can find a way to unstop time, and, unless we set them to cast in sequence to keep us immune, we only have 8 hours.

Each ring of 3 wishes we can procure buys us 24 hours of time stop immunity.