PLANETARY DESTRUCTION: When you reveal your force, you may place 3 "DRILL" special terrain markers on the map outside of starting areas. At the beginning of your turn, as a free action, you may deal 1 penetrating damage to each character occupying a square containing one of these markers. At the end of your turn as a free action you may place each of these markers into a square adjacent to its current square that doesn't contain another "DRILL" special terrain marker. When Imperiex is KO'd, remove these markers from the map.

Can the "DRILL" markers be destroyed like objects?

No. They are special.

Emperiex Objects

It's on the same page.

Ok, thanks fellas.