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I also suggest implementing character progression... that is, not just +1 to a skill, but also granting abilities. For example, if a player is a Necromancer, they would have:
1.1. Summon Warrior - summons 1 skeleton per day. ->
1.2. Summon Warrior (1) - summons 2 skeletons per day ->
1.3. Summon Warrior (3) - summons 3 skeletons per day ->
2. Raise Dead - summons 1 zombie per day ->
2. Raise Dead (2) - summons 2 zombies per day ->
2. Raise Dead (3) - summons 3 zombies per day ->
3.1 Power of Death - summons 1 ghost per day ->
3.2 Power of Death (2) - summons 2 ghosts per day ->
3.3 Power of Death (3) - summons 3 ghosts per day ->
4.1 Power of Darkness - summons 1 vampire per day ->
4.2 Power of Darkness (2) - summons 2 vampires per day ->
5.1 Master of Necromancy - summons 1 lich per day ->
The skill allows you to summon only 1 creature...
For example, if I have Power of Death, I can only summon 1 ghost, not a ghost, 3 zombies, and 3 skeletons.
And create skills for each class, but I don't want to write them because I'm sure this idea will be rejected. :( :( :( :(