New Spell Burrow

The burrow spell allows the user to hide there troops underground and out of harms way temporarily. It should only affect troops on the ground and in the spells range. This spell can add to a lot of diverse strategies it can also help save bunched up troops from traps such as bombs if the player can drop it fast enough. Even though the units are underground defense and clan castle troops defending the base with splash damage should damage the burrowed troops but at a minimum. The spell should only work on troops that were deployed prior to the drop if the spell other troops should be unaffected if the spell is still active adding to more interesting type of attack