Rahkshi Kaita Di are large dinosaur-like Rahkshi Kaita formed by the combination of Guurahk, Vorahk and Kurahk. They are incredibly strong, incredibly aggressive, and very nearly mindless, often having to be “encouraged” by their Makuta creators to attack what they’re supposed to as opposed to, say, a nearby rock or tree that the believe presents some form of danger. Despite this, they are quite dangerous in battle. Each has a mighty spiked tail, inside which the kraata is borne, and their clawed hands function as disintegrator beam emitters.
However, the most powerful weapon available to a Kaita Di is the massive harpoon launcher that can fold out of its back. A volley of harpoons fired by a battalion of Kaita Di is capable of downing even gargantuan Rahi such as Tahtorak or- hypothetically- the Zivon or Kanohi Dragon. As such, the Di were once used as animal control units by the Makuta in case a Rahi experiment ever went on a rampage. Since their fall from grace, though, the Brotherhood has mostly been using the Kaita Di as siege engines, since their Toa-sized harpoons are equally as good at tearing through walls as they are at felling giant Rahi.
EDIT: Spelled Guurahk wrong, whoopsy