ToME: the Tales of Maj'Eyal

It can be less effective than inner demons, but as of now can't be used on bosses while the latter can. Shadow simulacrum could check if they can be pinned or stunned, as if their shadow was being pulled off them and they could avoid it by moving through the light. If nothing better temporal clone could be reduced time on bosses.

Yeah, I'd make it instead of being banned from them have a damage reduction, or maybe reduced base global speed or something.

Temporal Clone as well, please. And give them drastically reduced durations against bosses, as an alternative to damage or global speed reduction.

Bumped with a new idea

I agree. Make it like Inner Demons, where the clone is weaker if it came from a high-ranking enemy.