End spike

Obsidian pillars, also known as obsidian spikes or obsidian towers, are generated structures in the End that are made of obsidian.

Generation
Obsidian pillars generate naturally the first time the player enters the End and regenerate when the dragon is respawned.

Structure
Obsidian pillars are composed of obsidian, with a single bedrock block and an ender crystal on top of each pillar. They have circular forms.

The following 10 Pillars generate in a 43-block radius circle around the exit portal in a random order:
 * A 3-block radius pillar ending at y=76 (total of 1596 blocks of obsidian);
 * A 3-block radius pillar with iron bars ending at y=79 (total of 1659 blocks of obsidian);
 * A 3-block radius pillar with iron bars ending at y=82 (total of 1722 blocks of obsidian);
 * A 4-block radius pillar ending at y=85 (total of 3145 blocks of obsidian);
 * A 4-block radius pillar ending at y=88 (total of 3256 blocks of obsidian);
 * A 4-block radius pillar ending at y=91 (total of 3367 blocks of obsidian);
 * A 5-block radius pillar ending at y=94 (total of 5358 blocks of obsidian);
 * A 5-block radius pillar ending at y=97 (total of 5529 bocks of obsidian);
 * A 5-block radius pillar ending at y=100 (total of 5700 blocks of obsidian);
 * A 6-block radius pillar ending at y=103 (total of 9167 blocks of obsidian).

The second and third shortest pillars include a cage comprised of 73 iron bars surrounding the end crystal, to protect it from projectiles.

In the Console Edition, the ender crystals on the two tallest obsidian pillars are surrounded by iron bars.