As for the skill I will be taking at Level 15:

Speed time - This melee weapon skill allows the user to gain a rush of adrenaline, which in turn seemingly slows down time for the user, allowing him/her to get in more attacks and react more quickly than normal.
LVL 7 skill. Requires 7 STR and 7 DEX. +2 DEX and +2 PER, high reaction speed.

Pressuring - User strikes their opponent's pressure points either with a blunt weapon or fists to stun the opponent for one round and slowing them down for longer.
LVL 6 skill. Requires 6 STR, 6 DEX and 6 PER. -2 DEX.

Dodge - It is not just Strength that wins a fight, and this skill is one that proves it. The user makes use of their dexterity to fancily make their way out of a dangerous situation.
LVL 3 skill. Requires 7 DEX. Consume additional LVL 1 skill to avoid additional attacks in the same round that would normally hit.

Adrenaline rush - By learning how to activate adrenaline on will, the user can eliminate their sense of pain for a short time. Lasts 2 rounds.
LVL 3 skill. Requires 6 STR. +2 VIT.

Dash - The user puts all their energy into pushing their legs beyond their limit, forcing them to run much faster.
LVL 1 skill. Requires 5 DEX. +3 DEX, but only towards running, for one round.