12月29日，DOTA2客户端更新6.86新版本的平衡性补丁6.86C，大小为64.9MB。
英文更新日志：
* Alacrity damage/speed rescaled from 30/40/50/60/70/80/90 to 10/25/40/55/70/85/100
* Invoker base strength reduced by 2
* Time Walk cast range increased from 550 to 625
* Faceless Void strength gain increased from 1.6 to 1.8
* Time Dilation duration increased from 5.5/7/8.5/10 to 6/8/10/12
* Time Dilation cooldown increased from 34/28/22/16 to 36/30/24/18
* Call Down first missile damage decreased from 220/285/350 to 200/275/350
* Walrus Punch cooldown increased from 20/16/12 to 36/24/12
* Nightmare cooldown increased from 16/15/14/13 to 22/19/16/13
* Tricks of the Trade cooldown reduced from 70 to 40
* Tricks of the Trade AoE increased from 475 to 500
* Blink Strike cast range increased from 700 to 800
* Blink Strike cast point reduced from 0.4 to 0.3
* Arcane Orb int steal increased from 1/2/3/4 to 2/3/4/5
* Arcane Orb int steal duration increased from 40 to 50
* Shallow Grave cast point increased from 0.35 to 0.4
* Shadow Wave manacost increased from 80/90/100/110 to 90/100/110/120
* Winter's Curse attack speed bonus increased from 50 to 70
* Tombstone cooldown increased from 60 to 70
* Surge manacost increased from 20/30/40/50 to 50
* Death Prophet base intelligence increased by 3
* Spirit Siphon HP Drain increased from 1/1.8/2.6/3.4% to 1/2/3/4%
* Spirit Siphon slow rescaled from 6/10/14/18% to 5/10/15/20%
* Exorcism duration increased from 30 to 35 seconds
* Radiant Small Camp's spawn box is now smaller
中文翻译如下：
灵动迅捷(卡尔)伤害/速度从30/40/50/60/70/80/90调整为10/25/40/55/70/85/100
祈求者(卡尔)的基础力量减少2点
时间漫游(虚空假面)的施法距离从550提高为625
虚空假面的每级力量增长从1.6提高为1.8
时间膨胀(虚空假面)的持续时间从5.5/7/8.5/10提高为6/8/10/12
时间膨胀的冷却时间从34/28/22/16提高为36/30/24/18
召唤飞弹(矮人直升机)第一枚导弹的伤害从220/285/350减少为200/275/350
海象神拳(海民)的冷却时间从20/16/12提高为36/24/12
噩梦(祸乱之源)的冷却时间从16/15/14/13提高为22/19/16/13
绝杀秘技(力丸)的冷却时间从70降低为40
绝杀秘技的技能范围从475提高为500
闪烁突袭(力丸)的施法距离从700提高为800
闪烁突袭施法点从0.4降低为0.3
奥术天球(殁境神蚀者)的智力偷取从1/2/3/4提高为2/3/4/5
奥术天球智力偷取持续时间从40提高为50
薄葬(戴泽)的施法点从0.35提高为0.4
暗影波(戴泽)魔法消耗从80/90/100/110提高为90/100/110/120
寒冬诅咒(冰龙)的攻速加成从50提高为70
墓碑(不朽尸王)的冷却时间从60提高为70
奔腾(黑暗贤者)的魔法消耗从20/30/40/50提高为50
死亡先知的基础智力提高3点
吸魂巫术(死亡先知)的血量吸取从1/1.8/2.6/3.4%提高为1/2/3/4%
吸魂巫术的减速从6/10/14/18%调整为5/10/15/20%
驱使恶灵(死亡先知)的持续时间从30秒提高为35秒
天辉小野点的出生范围判定现在缩小一些
修复德鲁伊升级变形术的时候血量没有增加的问题
19游戏网整理报道