Might wanna change the stats for the D-rank Tank

D rank spell Capabilities: (D rank would have 100hp) (Max 10 D rank spells) (4 Free D rank spells)
-30 meters range
-First degree burns
-5 meter radius explosions
-20 damage
-30 defense power spell
-plus 10 stat points (plus supportive effect)

C rank spell Capabilities: (C rank would have 200hp) (Max 10 C Rank spells) (3 Free C Rank spells)
-50 meters range max
-Second degree burns
-10 meter radius explosions max
-40 damage
-60 defense power spell
-Plus 15 stat points (plus supportive effect)

B rank spell Capabilities: (B rank would have 300hp) (Max 6 S rank spells) (3 Free B Rank Spells)
-80 meters range max
-Third degree burns
-15 meter radius explosions max
-80 damage
-120 defense power spell
-Plus 25 stat points (plus supportive effect)

A rank spell Capabilities: (A rank would have 400hp) (Max 4 A rank spells) (2 Free A rank spells)
-100 meters range max
-Fourth degree burns
-25 meter radius explosions max
-160 damage
-240 defense power spell
-Plus 35 stat points (plus supportive effect)

S rank spell Capabilities: (S rank would have 500hp) (Max 2 S rank spells) (1 free S Rank spells)
-150 meters range max
-Fourth degree burns
-50 meter radius explosions max
-320 damage
-480 defense power spell
-Plus 50 stat points (plus supportive effect)

Now that spell damage considered, blunt attacks would deal 5 damage.
Melee Weapons:
F Rank: plus 0 damage
D Rank: plus 5 damage
C Rank: plus 10 damage
B Rank: plus 15 damage
A Rank: plus 20 damage
S Rank: Plus 25 damage

As damage is placed down, strength will increase physical damage depending on the enemy's defense. For each 10 more points in strength than the target's defense, he deals 5 more damage. Magic power will increase spell's damage. For each 5 more points in magic power than the enemy's defense, a spell will do 5 more damage to it's target; however, the same goes for defense, for every 10 more points in defense than the enemy's strength, he will receive 5 less damage, and for each 5 more points in defense than the enemy's magic power, he will receive 5 less damage from spells.
Stats

Primary Magic is gifted with:
4 D Rank Spells (Once D Rank) |Can Have maximum 10|
3 C Rank Spells (Once C Rank) |Can Have maximum 8|
3 B Rank Spells (Once B Rank) |Can Have maximum 6|
2 A Rank Spells (Once A Rank) |Can Have maximum 4|
1 S Rank Spells (Once S Rank) |Can Have maximum 2|

Secondary Magic can be Purchased/Trained. You get:
3 D Rank Spells (Once D Rank) |Can Have maximum 5|
2 C Rank Spells (Once C Rank) |Can Have maximum 4|
2 B Rank Spells (Once B Rank) |Can Have maximum 3|
1 A Rank Spells (Once A Rank) |Can Have maximum 2|
1 S Rank Spells (Once S Rank) |Can Have maximum 1|