The Amumu build for Jungle is Jak'Sho, The Protean and Conqueror. This LoL Amumu guide for Jungle at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Amumu Counters
48.8%
(-5.2%)
40.2%
(-4.8%)
3.0%
(-0.3%)
1.1%
(-0.2%)
580
(+13)
