Java Edition 18w15a

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

Additions

 * Blocks
 * Blue Ice
 * Spawn in icebergs.
 * More slippery than ice or packed ice.
 * Version exclusive : Conduit
 * Crafted using 1 Heart of the Sea and 8 Nautilus Shells.
 * Can be activated by placing prismarine, prismarine bricks 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.
 * A complete structure will fully power the conduit.
 * When active at full power the range will increase and hostile mobs near the conduit will take damage.
 * Emits a strong glow, at light level 15.


 * Items
 * Heart of the Sea
 * Used to craft conduits.
 * Not available currently in survival.
 * Nautilus Shell
 * Used to craft conduits.
 * Can be obtained by fishing.
 * Drowned occasionally spawn holding a nautilus shell.


 * Mobs
 * Dolphins
 * Spawn in any ocean that isn't frozen.
 * Neutral mobs. Like wolves and zombie pigmen, dolphins will attack in groups if one is angered.
 * Can be fed using raw cod, but they don't breed.
 * Play with nearby items by picking them up and dropping them after a very short moment.
 * Chase after boats and jump over water surfaces.
 * They suffocate after spending too much time on land


 * Options
 * Version exclusive : Added Biome Blend distance video option


 * Structures
 * Icebergs
 * Generate on deep frozen oceans.

Changes

 * Blocks
 * Water
 * Has a new texture.
 * Now only blocks 1 light per block, instead of 3.
 * This only affects newly placed water.
 * Underwater vision from previous snapshots is gone: water is darker at lower depth.
 * Ocean variants have their own water colors, and the swamp water 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.


 * Other
 * Optimized fog rendering

Video
Video by slicedlime: