The Spiker is an alien defense structure that works like a regenerating proximity mine. It shows ten to twenty big spikes facing outwards in all directions. When a human approaches or the structure is hurt, all spikes are shot at once, causing severe damage at close distance. During a cooldown period, the spikes will grow back and a finishing animation will visualize that they are ready to be fired again.
Possible sources of inspiration include nature and existing alien buildable concepts (Barricade, Booster) and models (Gas Flower, Trapper). It would be desireable that the structure showed (remainders of) a six-eyed face. Other leftovers of an existence as a mobile life form such as arms or mandibles are possible, too.
The structure can be built on walls and ceiling and should have a roughly cubic bounding box.