I'm not against walls of text, but this is needing icons.
Builder upgrade:
Aura Radius Increase From 300 to 400 Rank 1 : Cost 1000 Lumber 10 Gold
Aura Radius Increase from 400 To 500 Rank 2 : Cost 2000 Lumber 15 Gold
Aura Radius Increase from 500 to 600 Rank 3 : Cost 3000 Lumber 20 Gold
Aura Radius Increase From 600 to 700 Rank 4 : Cost 4000 Lumber 25 Gold
Aura Radius Increase from 700 To 800 Rank 5 : Cost 5000 Lumber 30 Gold
thats a shitton of lumber for each upgrade.
Mana Increase (similiar to health upgrade) increases Mana by 50 Costs 15 gold
Mana Increase (similiar to health upgrade) increases Mana by 50 Costs 25 gold
Mana Increase (similiar to health upgrade) increases Mana by 50 Costs 35 gold
Mana Increase (similiar to health upgrade) increases Mana by 50 Costs 45 gold
So you get half as much from this as you would from getting hp tomes, if your getting it for mana shield. The first one is acceptable, if not excessive, but the other are all way to high. If you compare it to mag, he spends 250 lumber and 1 gold for 25 mana.