The obelisk is a heavy-duty defensive structure. It accumulates a huge amount of energy in special condenser crystals, after which it emits a directed beam into the enemy. Since the energy consumption of the obelisk during its operation is very high, it is almost devoid of shield. In battle, the obelisk consumes all the energy of the colony: to ensure the functioning of a single obelisk requires a pylon level of more than 12, or the level of the psi field concentrator. Approximately 70% of the obelisks recover after the battle.