Alternative Power Supply

Collect 6 Power Crystals from the distribution devices on the Isle of Perils and bring them to Charles de Doucer in the Refuge.

Captives of the illusory world are sleeping in their sarcophaguses and dreaming of the green Irdrich. The longer they lie there, the more energy their Sparks give to Tep. To be defeated in the real world, Tep must be deprived of his supplies, disconnected from the illusory world. To do that, we need to get there somehow. Not as victims, but on our own terms.
The Resistance has got a broken sarcophagus, and I was able to fix and reconfigure it. However, if you get inside it now, it will feed on the light of your Spark. An alternative power supply is needed. Luckily, there is one. There used to be a lab on the isle we now call the Isle of Perils. Tep used to conduct his first experiments with sarcophaguses there. Early models were not very efficient, so they fed on the power crystals. Those crystal are very likely to still be there.
The only problem is: how do we get them? You see, the early version of the system failed, and all of the test subjects went insane. They destroyed the lab, slaughtered the scientists and smashed the equipment... The lab was closed and forgotten, but those wretched souls still wander around the isle - even death could not stop their madness. They pounce on everything they see. Be careful!

Tep promises power, glory and immortality, but all he gives is madness and death. What a moron I was to trust him!

You can now enter the illusion and retain your memory, consciousness and willpower. This gives us a fighting chance!