Shayuri - Sorry if the encounter seems too tough. SR 38 gives Sigil a 25% chance of penetrating, the ooze is really tough but doesn't do a whole lot of damage, and a means of resupply is already in the wings. My hope is that the encounter will prove challenging, even scary, but not insurmountable.
Things will probably continue to be hairy if you continue. But I'm not trying to signal you all to leave. You could do so, and still have action-ey stuff to do. Or you could head all the way back to your own worlds and delve into intrigue. Either way is fine with me.
CrG - Welcome! You can have 9th level mauevers or Dark Invocations and still be ECL 20.