Draining Bloon

The Sphinx takes 25 hits and doesn't spawn anything. However, it drains magic. Any magic or psionic tower is vulnerable to it. The bloon will gravitate to the most powerful mage or psion, and feed on their energies on a rate of 1 HP per second. Upgrades will protect the tower, worth 5 HP each, but if an upgrade is eaten, the tower cannot use the upgrade for 10 seconds. The Sphinx regains 1 HP for every 2 HP drained. The Sphinx goes for the strongest upgrade. It can fly to the finish with no regard for the track, but it will only ever do this if there are no mages or psions left.