Omegachi V

The Omegachi V is an upgraded version of the original Omegachi. It is the ultimate weapon used by the Monkeys, used to fight the E.M.P.E.R.O.R., which is also the reincarnated upgrade of the E.N.T.I.T.Y. The Omegachi V appears in BTD7: Planet of the Apes. Like its predecessor, it has been split into 5 parts.

Backstory
After the defeat of the ENTITY, the Monkeys in Meta07's timeline have been upgrading it ever since. However, strange quantum forces due to the interaction of Meta07's timeline with the official timeline have blasted apart the Omegachi and sent it (and many of the Monkeys) travelling to the official timeline with the 5 pieces scattered in various places. In BTD7PotA, you must find these pieces in order to fight the E.M.P.E.R.O.R.

Cannon
The ways to obtain it are different than in Meta07's BTD6. In BTD7PotA, it has been found by a battalion of Bloons and are attempting to bring it to the E.M.P.E.R.O.R. The quest involves intercepting the group and taking the Omegachi Cannon from them (This is part of the Story Mode so you're in first person shooter gameplay while doing this).