December 29, 2015 Patch

{{Patch layout
 * sort = 2015-12-29
 * source = http://store.steampowered.com/news/19848/
 * source-title = Dota 2 Update - December 29th 2015
 * before = December 24, 2015 Patch
 * after = January 02, 2016 Patch
 * notes =

6.86c
}}
 * damage/speed rescaled from 30/40/50/60/70/80/90 to 10/25/40/55/70/85/100
 * base strength reduced by 2
 * cast range increased from 550 to 625
 * strength gain increased from 1.6 to 1.8
 * duration increased from 5.5/7/8.5/10 to 6/8/10/12
 * cooldown increased from 34/28/22/16 to 36/30/24/18
 * first missile damage decreased from 220/285/350 to 200/275/350
 * cooldown increased from 20/16/12 to 36/24/12
 * cooldown increased from 16/15/14/13 to 22/19/16/13
 * cooldown reduced from 70 to 40
 * AoE increased from 475 to 500
 * cast range increased from 700 to 800
 * cast point reduced from 0.4 to 0.3
 * int steal increased from 1/2/3/4 to 2/3/4/5
 * int steal duration increased from 40 to 50
 * cast point increased from 0.35 to 0.4
 * manacost increased from 80/90/100/110 to 90/100/110/120
 * attack speed bonus increased from 50 to 70
 * cooldown increased from 60 to 70
 * manacost increased from 20/30/40/50 to 50
 * base intelligence increased by 3
 * HP Drain increased from 1/1.8/2.6/3.4% to 1/2/3/4%
 * slow rescaled from 6/10/14/18% to 5/10/15/20%
 * duration increased from 30 to 35 seconds
 * Small Camp's spawn box is now smaller
 * Fixed 's HP not increasing when upgrading