End crystal
From Tardis Wiki, the free Doctor Who reference
"End crystal" is a title based upon conjecture.
Check the behind the scenes section, the revision history and discussion page for additional comments on this article's title.
A series of floating crystals with pink cores, floating over fire on obsidian pillars in The End, were destroyed consecutively by the Fourth, Sixth, and War Doctors in a fight against a dragon. (WC: Doctor Who Comes to MINECRAFT!)
Behind the scenes
Although the crystals weren't named in WC: Doctor Who Comes to MINECRAFT!, they were called 'End Crystals' in Minecraft.