Transcendent Embryo

It grants a Common Chaos blessing immediately and replaces it after every eight encounters.

Use it when

Use it when the build is already functional and can accept a changing Chaos bonus.

Limit

The blessing is random and may change away from an effect the build was using.

If it is absent

Use a god keepsake when the run still needs a predictable main Boon.

When to replace it

Keep it while its condition supports the current route, then replace it when another keepsake solves a more immediate constraint.