[Edi]

It turns to a unit named "Archerless Chariot" that is essentially the same as a normal chariot. The Archerless Chariot disappears after the battle, though, like the Pythian serpent from the serpent cataphract, so I would not buy them. If the archerless chariot stayed around like the Machakan spiders, that would be a different thing and the unit would be worthwhile.