Doomtanium

Doomtanium is a gem-like substance introduced in Plants vs. Zombies: Unlikely Alliance that is used by Dr. Zomboss to create powerful weapons. Though mentioned several times, Doomtanium does not actually appear in-game until the final world, Doomsday Dimension, where it takes various forms each with different purposes.

Doomtanium Fragments
Doomtanium Fragments are the first type of Doomtanium to appear, debuting in Doomsday Dimension Night 1. It is a simple barricade, much like the tombstones in Plants vs. Zombies 2: It's About Time. Doomtanium Fragments also sometimes give coins when destroyed, much like the tombstones in the original game. They are the only type of Doomtanium that can be destroyed permanently.

Overview
Doomtanium Fragments absorb 25 normal damage shots. Appearance changes upon absorbing 8, 15, 22, and 24 normal damage shots before breaking at 25 normal damage shots.

Doomtanium Beams
Doomtanium Beams are large Doomtanium crystals bolted to a golden circle on the ground. They project a laser beam that will damage any plant or zombie in the way, but it can be reflected using a Magnifying Grass, changing the beams direction. Doomtanium Beams are also important for the final battle with the Zombot Mark II in Doomsday Dimension Night 10, as they are the only way to damage the Zombot as Dr. Zomboss happens to be at the top of the screen, making your plants unable to attack it.