Even if he counters time stop wish upon a star and purpose of life will kill them, if that doesn't work.

Ainz can order one of his minions to use Longinus.

Stop posting spoilers wtf

Rimuru has Time-Stop Immunity though, along with his most op Skill "Azathoth" which allows the following

Soul Gluttony:
A super-evolved form of "Predation" that allows Rimuru to consume not just physical matter but also the target's soul, ignoring space and time constraints.

Nihility Collapse:
This ability allows Rimuru to harness and manage the destructive energy of the chaotic Imaginary Space. With the help of Ciel, Rimuru can use this energy for various purposes.

Imaginary Space:
Essentially a chaotic world that acts as a prison, used for isolating or analyzing individuals. It can also be used to store and manage skills and energy.

True Dragon Release [Scorch・Storm]:
Allows for the manifestation of Veldora and Velgrynd's power in the external world, while their core remains protected within Imaginary Space.

Spacetime Domination:
Grants Rimuru control over space and time, enabling abilities like Instant Motion and Spacetime Connection.

Multidimensional Barrier:
A powerful barrier-type skill that provides absolute defense through a combination of multi-layered barriers and Dimension Fault.

The end?

Ainz casts, Time Stop, True Death, Wish Upon A Star and Goal Of All Life is Death.
The end.

lol XD

you need to leave