Kekimurus

The Kekimurus is an generating flower added by Botania. It generates Mana by consuming Cake.

Usage
Every, the flower attempts to consume one slice of Cake in an 11×11×11 area around itself, producing 1,800 Mana per slice, resulting in 12,600 per Cake.

A Kekimurus can store 9,001 Mana internally, and can be bound to a Mana Spreader within 6 blocks of itself to transfer its Mana.

Cake reactor
If Thaumic Tinkerer is installed alongside Botania, a powerful, but potentially dangerous, build nicknamed the "cake reactor" becomes available. The build is reliant upon the extremely unusual ability of Aer Imbued Fire to transform Water into Cake.

To construct a cake reactor, build a large open box four blocks high (two blocks high inside). The floor, walls, and roof should be made with materials created by the fire, such as Sandstone or Glass. Fill the inside of the box with Water, 1 block high. Place several Kekimurus below the block (Floating Kekimurus are recommended for this), along with a large number of Gaia Mana Spreaders (because this will produce Mana very, very fast; a 10x10 box can easily feed 12 Kekimurus, each with its own Spreader). Make sure the Mana Spreaders all have Mana Pools to fire at, one or more of which should have a Mana Void below. Break one block out of the roof, preferably in the middle, place a single non-desert block (such as Leaves) in the water, and ignite it with a phial of Aer Imbued Fire. Wait about 5 seconds, break the block, and re-seal the reactor. If you still hear fire sounds, the reactor has started. It will now begin to convert Water into Cake, which will be devoured by the Kekimurus below for Mana.

If the reactor walls or roof have non-desert blocks in them, those blocks will catch fire, turn into desert blocks, and potentially spread the fire to other blocks outside the reactor. As most people do not want entire worlds turned into deserts, this would be very bad. Building the Reactor several blocks above ground (floating) would be a safe solution.

If the Kekimurus cannot transfer their Mana fast enough, Cake will start to accumulate in the reactor. If all Water source blocks are converted into Cake, the reactor will shut down and will need to be manually restarted with more Aer Imbued Fire.

Pumpkin starlight transformer
If Astral Sorcery is installed alongside Botania, Cake can be created by pointing starlight at Pumpkins. An automated setup could use an enhanced Celestial Collector Crystal shining on a pumpkin stem through a Growth lens, and directly on the spots where the pumpkin can grow. While usually much slower than the 1.7.10 era Thaumic Tinkerer cake reactors, there are no risks associated with this setup.

Trivia

 * The tooltip is a reference to the line "The Cake is a Lie" from Portal.