Battlemage set upgrades
First of all check Tier Sets For more information about how to get tier set upgrade tokens.
-T1
You need 4 tier set upgrade tokens to upgrade your starbringer set into battlemage set (T1) and 1 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +33, max health +15%, max mana +20%, protection physical +17%, death +12%,health regen +165/1s, mana regen +970/1s, mana leech +12%, critical damage +20%, mana cost reduction +3%, movement speed +2%).
Battlemage helmet (T1) , Battlemage Chestplate (T1) ,Battlemage legs and Battlemage boots
-T2
You need 8 tier set upgrade tokens to upgrade your battlemage set (T1) into battlemage set (T2) and 2 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +35, max health +15%, max mana +24%, protection physical +17%, death +12%,health regen +165/1s, mana regen +1065/1s, mana leech +16%, critical damage +21%, mana cost reduction +3%, movement speed +2%).
Battlemage helmet (T2), Battlemage chestplate (T2), Battlemage legs (T2) and Battlemage boots (T2)
-T3
You need 12 tier set upgrade tokens to upgrade your battlemage set (T2) into battlemage set (T3) and 3 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +35, max health +15%, max mana +28%, protection physical +17%, death +12%,health regen +165/1s, mana regen +1160/1s, mana leech +16%, critical damage +21%, mana cost reduction +3%, movement speed +2%).
Battlemage helmet (T3), Battlemage chestplate (T3), Battlemage legs (T3) and Battlemage boots (T3)
-T4
You need 16 tier set upgrade tokens to upgrade your battlemage set (T3) into battlemage set (T4) and 4 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +37, max health +15%, max mana +32%, protection physical +17%, death +12%,health regen +165/1s, mana regen +1255/1s, mana leech +20%, critical damage +22%, mana cost reduction +3%, movement speed +2%).
Battlemage helmet (T4), Battlemage chestplate (T4), Battlemage legs (T4) and Battlemage boots (T4)
-T5
You need 20 tier set upgrade tokens to upgrade your battlemage set (T4) into battlemage set (T5) and 5 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +37, max health +15%, max mana +36%, protection physical +17%, death +12%,health regen +165/1s, mana regen +1350/1s, mana leech +20%, critical damage +22%, mana cost reduction +3%, movement speed +2%).
Battlemage helmet (T5), Battlemage chestplate (T5), Battlemage legs (T5) and Battlemage boots (T5)
-T6
You need 24 tier set upgrade tokens to upgrade your battlemage set (T5) into battlemage set (T6) and 6 tier set upgrade token for 1 piece.
When you put all set you get next stats :(Arm: 44, magic level +39, max health +15%, max mana +40%, protection physical +17%, death +12%,health regen +165/1s, mana regen +1435/1s, mana leech +23%, critical damage +23%, mana cost reduction +4%, movement speed +2%).
Battlemage helmet (T6), Battlemage chestplate (T6), Battlemage legs (T6) and Battlemage boots (T6)
Big thanks for Diath and Despacito