Excellent feedback.
'No problem with ichor rules' -- then I won't change.
'1) A Leaf Pile cannot voluntarily move onto any square that contains
at least one mummy or statue, period.'
This was the original rule and I think it may be better to revert to it.
'2) A Leaf Pile can voluntarily move onto to a square that contains any
number of mummies and statues, if and only if there is at least one
other mobile piece to engulf.'
This is what I really wanted to change it to, but I hurried and messed it
up. However, I think it makes for a faster and more exciting game if
the mummy/statue confers temporary immunity (but very double-edged
because
the mobile piece is compelled to move off).
Leaf piles have no heads, so you can't get into its head. However, you
have comprehended its primordial nature.