What planet pounder is most potent?

The most powerful planet destroyer is without a doubt the Hand of Omega. At the Doctor’s command, it destroyed a planet many light years away and millennia in the future, destroying the alien warships surrounding Earth on its way back to its resting place in time-space, and returned in less than a minute.

It’s never been said where Mantrid’s name comes from, but I always assumed it was a play on mantid (a type of insect). It is also possible that it derives from the Sanskrit word “mantrin,” meaning “wise man.” Or perhaps the writer arrived at the mad scientist’s name through a deliberate blending of the two words (wise insect?). Actually, I recently discovered that the Greek word “mantis,” now given to insects of the mantid order, originally meant “a half-incomprehensible prophet,” and comes from the same root as the Sanskrit “mantrin.”