January 31, 2017 Patch

{{Patch layout
 * sort = 2017-01-31
 * source = http://store.steampowered.com/news/27203/
 * source-title = Dota 2 Update - January 31th, 2017
 * before = January 29, 2017 Patch
 * after = February 01, 2017 Patch
 * notes =
 * Fixed {{H|Axe}}'s {{A|Culling Blade|Axe}} with Blood Chaser.
 * Fixed a bug where Daily & Weekly Quests in the Winter 2017 Battle Pass were not granting their point rewards. These have been retroactively granted.
 * Fixed a bug where the trophy and emoticon rewards for winning the Dark Moon event were not being granted. These have been retroactively granted.

Dark Moon

 * Added 10 new heroes:, , , , , , , , , and.
 * Fixed an exploit that let sell items from creep illusions.
 * Fixed a bug that could cause the round 5 Bonus Chicken to teleport out too early.
 * Fixed a bug with the round summary that could cause a loop sound to play until the next round ended.

Dark Moon

 * Reduced cooldown.
 * Increased damage.
 * Increased damage bonus.
 * Increased stun duration.
 * Reduced ’s mana cost.

Dark Moon

 * Reduced cooldown.
 * Reduced hp cost.
 * Increased damage per second.
 * Increased movement slow.
 * Reduced ’s hp cost per second.
 * Increased ’s heal percent.

Custom Games
}}
 * Fixed a bug with Fog of War display in custom games with large maps.
 * Fixed an issue with the hero picker blocking the custom game team setup screen by default.
 * Fixed a regression in spawning runes in custom games.
 * Fixed several issues in Overthrow, Colosseum, and 10v10.