The Hecarim build for Jungle is Duskblade of Draktharr and Phase Rush. This LoL Hecarim guide for Jungle at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Hecarim Counters
50.1%
(+2.9%)
60.2%
(-0.1%)
5.2%
(+1.0%)
7.7%
(+0.4%)
687
(+66)
