When playing Charm in 4 player format, can you move one opponent's unit into another battlefield where another opponent's unit is occupying, causing a showdown? Also, what happens to hidden cards on a battlefield when a unit is moved away?

Ruling: Yes, you can use Charm to move one opponent's unit into another battlefield where another opponent's unit is occupying, causing a showdown. If a player no longer has a unit on a battlefield, any hidden card they have on that battlefield is discarded.

Sequence:

• Charm moves the opponent's unit to the new battlefield
• If another opponent has a unit there, a showdown is triggered
• If the moved unit was the player's only unit on the original battlefield, their hidden card on that battlefield is discarded

Nuances:

• Hidden cards are tied to having a unit presence on the battlefield - losing all units means losing the hidden card