Just a quick note, the Rune recently changed from Focus cost to Stamina cost, do not seem to be affected by Stamina Cost Reduction stats.
I have about 40.19% Stamina Reduction Stacked
- Head 6%
- Body 6%
- Legs 10%
- Gloves 6%
- Enchant 20% at Low Focus
Stamina Cost of Rune (Frost Dart) remains at 35.
Same case when tested with Firebolt, cost 35.
Same case when tested with a Bow / Arrow; Cost stayed at 25.