January 28, 2016 Patch

{{Patch layout
 * sort = 2016-01-28
 * source = http://store.steampowered.com/news/20160/
 * source-title = Dota 2 Update - January 27th, 2016
 * source2 = http://store.steampowered.com/news/20198/
 * source2-title = Update 2
 * before = January 27, 2016 Patch
 * after = January 28, 2016 Patch
 * notes =
 * Fixed various crashes, including frequent crashes on machines with Integrated Graphics Cards
 * Removed recent low priority penalties from affected users
 * Lots of memory optimizations
 * Various fixes to weapon ambient effects not showing the right color
 * Fixed {{Hero ID|Terrorblade}} Arcana specular

Update 2

 * Fixed a bug that was preventing completion of the final quest
 * Fixed a bug with not getting credit for the Ultimate Damage challenge
 * Fixed missing particles in the portrait window of 's demon form
 * changes =

Winter 2016 Battle Pass Quests
}}
 * "Stun Heroes" duration now changed from 100 to 90.
 * no longer included in the hero list of "Buy Aghanim's Scepter with Hero" quest
 * "Buy Aghanim's Scepter with Hero" time limit changed from 1500s to 1800s.
 * "Towers Killed" limit changed from 15 to 25.