- The devourer "looks" at you.
- Roll X dice, being X their Mind attribute.
- For every 5 or 6 in each die you have to make a Mind 2 Test (Mind 2 for each die individually).
- Each failed check causes you 1 Insanity point.
... simple rule, complex attack (and slow XD).
I hope it helps you.
Exactly how I read it, and now confirmed by DIG on Youtube.