Minecraft wiki entry for Ender_Dragon, associated text: She slowly ascends, her wings and body becoming more tattered until she disappears in beams of light erupting from her center.
There's an explosion of 12,000 experience points (ten drops of 960 and one drop of 2400) — enough to bring a player from level 0 to level 68.
The bedrock structure fills in with an End portal interface to become the exit portal, enabling the player to transport back to the Overworld and respawn at their spawn point.
A dragon egg appears above the island's central bedrock structure. If a block exists right above the center of the central bedrock structure, then the dragon egg spawns 1 block above the highest block at (0,0). If the highest block is at the height limit, then the dragon egg does not spawn.
An End gateway portal is generated floating within 75–100 blocks of the exit portal.