I think that Visions of Avarice centred in I27 could be worth a go. It'll take me time to post it tomorrow evening GMT and there may be a period where FourMonos has to check the enemy willpowers and move the monsters accordingly. It would possibly effect the whole lot - it could look something like this:
Lilli places the zone in square I27. To Hit rolls start with the G2 in D26, then G3 in D30, then G4 in D32, then G1 in D24, followed by the Beholder in N–O/27-28.
To Hit rolls and where they may get moved to:
G2 = Total to Hit: Willpower: xx. maybe Gets pulled to square I27 (the zone square, it would be highlighted in dark orange 1 on the Google sheet).
G3 = Total to Hit: Willpower: xx. maybe Gets pulled to square H28
G4 = Total to Hit: Willpower: xx. maybe Gets pulled to square I28
G1 = Total to Hit: Willpower: xx. maybe Gets pulled to square H26
Beholder = Total to Hit: Willpower: xx. maybe Gets pulled to squares J–K/27-28.
Does anyone have any problems with that?