Ultimate Batheo Athanaton Forum

Player Level | Title (Nobility) | Enhancement cost reduction

lv 150 Basileus: 10%

lv 140 Ephor: 7%

lv 140 Elder: 5.25%
lv 130 Elder: 4.5%

lv 130 Noble: 3%
lv 126 Noble: 2.8%
lv 125 Noble: 2.75%
lv 123 Noble: 2.65%
lv 120 Noble: 2.5%

...

lvl 117 Basileus: 5.87%
lvl 117 Ephor: 4.7%
lvl 117 Elder: 3.52%
lvl 110 Elder: 3%
lvl 104 Noble: 1.7%

Seems like each nobility's lvl gives additional bonus:
-0.125% for Basileus
-0.1% for Ephor
-0.075% for Elder
-0.05% for Noble