Java Edition 18w15a

18w15a is the thirty-first snapshot released for 1.13.

Additions

 * Blocks
 * Blue ice
 * A variant of Packed Ice.
 * Spawns in the new Icebergs.
 * Conduit
 * Can be activated by building a structure of prismarine, dark prismarine or sea lanterns around it.
 * When active, will affect players in water around it with the conduit power status effect.
 * Conduit power stops the breath meter from running out, gives underwater vision and increases mining speed.
 * When active, hostile mobs around it will be damaged.
 * Emits a strong glow, at light level 15


 * Items
 * Heart of the Sea
 * Used to craft the Conduit.
 * Nautilus Shell
 * Used to craft the Conduit.
 * Can be found by fishing.
 * The Drowned mob occasionally spawns holding a Nautilus Shell.


 * Mobs
 * Dolphins
 * Spawns in any ocean that isn't frozen.
 * Passive mob, but can attack in groups.
 * Plays with near items by picking them up and dropping them after a very short moment.
 * Chase after boats.

Changes

 * Water
 * Got a new texture.
 * Water now only blocks 1 light per block, instead of 3.
 * This only affects newly placed water - we will relight all chunks in an upcoming snapshot.
 * Ocean variants have their own water colors, and swamp color was changed.
 * In newly generated chunks, you're less likely to find frozen ocean next to warm ocean (and similar).

Swimming

 * You can now swim through one block holes.
 * The transition between swimming and normal state is now smoother.
 * Sprinting at the surface of water no longer makes you swim, instead you stay at the same altitude constantly.