I'm playing with builds for the Ruby Phoenix Tournament (RPT) for PFS and came up with the following Human Barbarian 8/Horizon Walker 3 ; this abuses the start/stop rage + fatigue/exhaustion immunity.
str 20 : 17+2+1 4th,
dex 14,
con 16 : 15+1 8th,
int 7,
wis 13,
cha 7
Invulnerable Barbarian 1 : Power Attack, Toughness
Barbarian 2 : Reckless Abandon
Barbarian 3 : Heavy Armor Prof (for mithral full plate, yes your ac is going to be bad, no reason to make it worse)
Barbarian 4 : Auspicious Mark
Barbarian 5 : Endurance
Barbarian 6 : Powerful Blow
Horizon Walker 1 : Desert Mastery, open feat
Horizon Walker 1 : Desert Mastery Exhaustion Immunity
Horizon Walker 1 : Desert Mastery Fatigue Immunity, Imp Crit Falchion
Barbarian 7
Barbarian 8 : Crippling Blow, Dazing Assault
with everything up and running
+3 Reckless Abandon -3 AC
+2/+3 rage
+5/+7 str
+11 bab
-3/+9 power attack
-5 dazing strike
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+13 att/+19 damage +for save 21 or dazed +2 str or dex damage (fort save 19 for half). Assuming you can close with the arcane caster, the Dazing Assault may just shut them down, and the str damage might take them to zero while they stand there dazed.
Before str boost belt and weapon enchantments, +13 to hit with a fort save of 21 or dazed plus lose 2 str or dex with a fort save of 19 for half. which you can do every round as you stop/start your rage at the start of each turn. Any any time you feel they will pass the dazing strike fort save, turn it off for a +18 + str damage every turn.
Not a pounce master, but an interesting idea to me any way for RPT