[quote=@vancexentan]
I didn't mean it'd be instantaneous. It'd be much quicker though if you did that too her instead of someone else though. As for how you'd get to her that's something for the enemy servants to attempt.
[/quote]

Considering the flag can't regenerate. Just bombard her fortress until it falls. The phantasm appears to be a once per incarnation thing with a long lifetime of usage but once it's gone. It's gone.

Lets say it can take up to 3 Anti-Fortress attacks regardless of parameters.

Considering Anti Army is third of Anti-Fotress. It can take 9 Anti-Army attacks
Considering an Army is comprised of at least say 50 people.

It can take 450 anti-unit based attacks at least and 980 at max.

And say regular attacks are one tenth of a phantasm at best. it can take 9800 basic attacks from a heroic spirt before it falls.

Jesus thats one hell of a shield.