underground serpent - 130 hp, ability: attacks from underground, the enemy cannot retaliate.
earth king - 150 hp, ability: attacks from underground, the enemy cannot retaliate,
an obstacle appears at the location where the attack was made (a PIT, the unit will not be able to cross it, unless it has the ability to fly).
5% chance to eat the opponent (number of opponents = 1/2 of the number of earth kings).
vulnerable to air magic, but immune to earth magic.