An Immovable object tries to attack...

[Saraphali]

Hola!

Was wondering what would happen if someone with this effect

Bane: You always go last in initiative order. You cannot take Improved Initiative. If multiple creatures with Overly Cautious are in the same encounter, they roll initiative only to determine what order they go in after all other characters have gone each round.

Tried to set up an ambush... like if they stealth around and saw an opponent, then attacked it.
would the creature under the effect get the surprise round, attack, then proceed to be in last place?

and what if said creature had companions to command?

Thanks for the insight

[Rub-Eta]

You're asking about 3PP material, so I'm not too confident.

But using the standard rules understanding, Overly Cautious does not make you unable to act in surprise rounds or change surprise rounds in any way, except for the order of initiative.

[Goth Guru]

Better to just have a defect Slowed, as if the spell is always on.
Much less confusing.