December 18, 2015 Patch

{{Patch layout
 * current = 2015-12-18
 * source = http://store.steampowered.com/news/19778/
 * source-title = Dota 2 Update - December 18th 2015
 * before = 2015-12-17
 * after = 2015-12-20
 * notes =
 * Improved Ward placement indicator.
 * Adjusted Fog of War visibility size for particle effects on {{Item ID|Hand of Midas}}, {{Hero ID|Sand King}}'s {{Ability ID|Sand Storm|Sand King}}, {{Hero ID|Tidehunter}}'s {{Ability ID|Ravage|Tidehunter}}, {{Hero ID|Vengeful Spirit}}'s {{Ability ID|Wave of Terror|Vengeful Spirit}} and {{Hero ID|Tusk}}'s {{Ability ID|Ice Shards|Tusk}}.
 * Fixed a general underlying issue that could cause various types of visual effects to appear through FoW (this fixes a certain class of visual effect bugs, but there are still a few edge cases we are working on).
 * Fixed an old bug where creeps would sometimes shortcut the lane if many trees were removed.
 * Fixed Illusions not benefiting from {{Item ID|Aghanim's Scepter}} upgraded {{Ability ID|Marksmanship|Drow Ranger}}.


 * SFM
 * Fixed {{code|dota_685}} and {{code|dota_desert}} maps not loading.
 * Fixed the game's current map pack from overriding the requested map in SFM.
 * Fixed bug where some bones weren't editable in the SFM ({{Hero ID|Axe}}, {{Hero ID|Omniknight}}, etc).
 * changes =
 * Added {{Ability ID|Cloak Aura|Centaur Courser}} icon for Hellbear and Centaur Courser.
 * Fixed default particle effect for Staff of Diviner's Embrace.
 * Fixed default particle effect for Blade of Broken Scale and Offhand Blade of Broken Scale.
 * Arc Warden's {{Ability ID|Tempest Double|Arc Warden}} no longer copies items that are not owned by Arc Warden anymore.
 * A typo in the Arcane Rune description has been fixed ('a' to 'an').
 * Negligible description update to Riki's Smoke Screen (a missing 'and' was added).
 * Added a new console command: {{code|dota_use_particle_fow_unbloated}} (Cheat).

Treasure

 * These treasures are similar to the versions released earlier this week, except they do not contain the very rare drop.

Tournament items
}}
 * Artifice Chapter 1 Online Tournament
 * Evil League Season 1