This particular slumber seems too easy for our group. What ends up happening is we farm him for TONS of Ether with almost no risk. We then immediately enter Lucid Mode which just lets us farm Ether even faster. (Note, he has a Contact/Assault 10 action for 1 Ether)
his Basic and Special actions do nothing until he Morphs? And with Lucid Mode it’s pretty easy to find cards that block turn steps or add/remove Turns to avoid him from ever Morphing at all.