Work a Miracle

Everything's bad. Everything's very, very bad. There's a mole in the Resistance that gave Tep the Refuge's coordinates. He even remembered to mention the mined bridges. Tep sent an elite assault squad here. They already arrived.
We repelled the first charge, but we won't last another one. Just now, the assault troops retreated to regroup. We need a miracle, or all your victories in the illusory world will be worth nothing. There will be no one there to fight the weakened Tep.
Fortunately, Spike and you already secured something of that sort. Remember the orb of invisibility? Here it is. We've tested it a few times already - it works with clockwork precision. While invisible, you'll be able to get through the lines of assault troops right to their leader. Fortunately, Tep's servants - machines and cultists alike - can't move until given orders. Kill him, that will give us a chance.

Tep likes obedient servants that don't reason. Let's see how they will fight when there's no one around to give orders!

They're retreating! You can officially declare yourself a miracle worker. While Tep is gathering a new squad, we'll make our move.