The powerful forest elementals
In times of danger or boredom, elves have been known to summon forth powerful forest elementals to do their bidding. These are not the nubile wood nymphs you see on some of the King's racier tapestries. These are unstoppable tree monsters that rip ogres clean in half for the amusement of the elven nobility.
Excellent defensive units, they are yet another example of elven contempt for fair play.