She can't find the space to do anything else around keeping that Image up, and it needs to stay up. Tencednil backs slowly out of the room, holding her concentration tightly as she goes. Her shadow follows.

The guard's wizard strides forward and sends a fireball flying through the illusory stone wall. 

A low roar fills the room. Four cultists burn to ash. Two are almost dead. The guard captain and Garril were both caught in the blast, and both still stand.

Shadi calls a burst of radiance down on Rolth. His skin sears further. Blood pours from his eyes. He stumbles back but still stands.

Two more cultists run in through the left door. One from the last group, barely alive, yells "The wall's an illusion!" with his raspy voice.

They both cast spiritual weapon. One phantom scythe swings at a marine and misses. One swings at Garril and also misses.

A woman in a dark green metal armor walks out of the door to the right. She gazes around at the destruction. "Filthy servants of death. Get out of my temple."

Flame Strike.

A column of fire, black as the night sky, burns three marines until they're charred and unconscious. The fourth barely manages to dodge out of the way.

The two clerics of Pharasma are turned to ash and bones.

Two cultists walk through the illusory wall and their spiritual weapons attack the last conscious marine. The phantom scythes slice across his chest. He refuses to fall.

The cultists swing at him with their physical scythes. He dances out of the way.

The cleric of Sarenrae clutches her holy symbol and channels. The torched marines slowly stand back up.

Rolth looks around with his bleeding eyes. He sees the piles of corpses. He sees the guards rushing forward. He sees the enemy wizard.

"Fuck this." Dimension Door.

Garril's readied crossbow bolt impacts the wall behind Rolth, just barely too late.

The captain yells! "Focus all attacks on the main cleric!"

Eight guardsmen pour forward. Their halberds swing as one. Lady Andaisin's divine focus is sundered. Her side is sliced open and bleeds.
 

Garril steps forward a few paces and takes the head off a cultist with his warhammer.

Meanwhile, the elevator reaches its destination...

The group of six exits the worryingly fast lift and sees a pair of solid wooden doors with Urgathoa's holy symbol painted across them.

Navarro puts his hand out. "They're trapped. I can see it. Disabling it will take too long."

The wizard casts summon monster, unusually quick as graduates of the Acadamae often do.

A dog runs forward and is sliced into pieces by scythes that emerge from the walls. A fine black powder falls from the ceiling. The trap remains still after firing.

"Through! Quickly!"

The doors are not locked. They open them and find a room full of crates. A particularly large one has been dragged into the chamber’s center, around which stand four mismatched chairs and stools.

The sounds of battle can be heard down the halls. "Hurry!" The second captain yells and runs forward.

Returning to the main fight...

The guard captain downs a cultist with his first swing and cuts deep into another with his second.

The marines are back up, the wizard is gone, and that's a fifth circle priest.

Twelve arrows. Four hits. Three sink into her chest, and one hits her right in the eye. She screams in agony.

The minor cultists aren't the threat here. The threat here is the fifth circle cleric of Urgathoa who they apparently knew nothing about. Which is its own catastrophe, but they can discuss that particular bit of idiocy later, when nobody is about to die. And hopefully after several people have died. No symbol will limit her substantially, and it means there's no risk of channeling. With that many guards on her, she would have a hard time casting anyway.

Her scythe is no less dangerous for all that, and a fifth circle cleric is about as good with weapons than your average marine. Better, with her buffs active.

On the other hand, for all her skill, she cannot see through an orb of perfect blackness. Obviously false, yes, but intangible! Physically passing through an intangible illusion doesn't make it obviously false like passing through a wall would. If she takes the time to look closely she'll find a flaw, but that will take her time away from murdering the guards around her.

Silent Image once more, elevated to encompass the woman's head but not going far enough down to make the guards miss her body. That should balance the scales a little.

The guard's wizard flings a lightning bolt through Lady Andaisin's chest. She stumbles back but still doesn't go down!