Weapon Blocking: Available at Level 10, Upgradeable 10 levels, Requires Stamina Upgrade Level 10. For each skill point that you invest in this skill, your physical evasion will rise by 1%. So, with this skill mastered, you will have increase your Physical Evasion by 10%. Its effect is noticeable when attacking large groups of enemies. Especially nice for PvP, especially in tandem with Evasion-enchanted shoes.

Weapon Specialist I: Available at level 30, Upgradeable 5 levels, Requires 2 SP to level once, Requires Weapon Blocking Level 10. For every 2 Skill Points that you invest into this stat, your Minimum Physical Damage will increase by 2 points. So, when this skill is mastered, your Minimum Physical Damage stat will be 10 points higher. 10 points = 10 damage more. So, calculating averages, you will be doing 5 more points of damage overall, when you completely level this skill up. A complete waste, don't bother. :\

Weapon Specialist II: Available at level 40, Upgradeable 5 levels, Requires 2 SP to level once, Requires Weapon Specialist I Level 10. For every 2 Skill Points that you invest into this stat, your Maximum Physical Damage will increase by 2 points. So, when this skill is mastered, your Maximum Physical Damage stat will be 10 points higher. 10 points = 10 damage more. So, calculating averages, you will be doing 5 more points of damage overall, when you completely level this skill up. Combine that with the bonus from Weapon Specialist I, and you will be doing a whopping 10 more damage per hit. I have never seen a poorer usage of 20 Skill Points... honestly.

Encouraging Shout: Available at Level 10, Upgradeable 10 levels. For each skill point that you invest into this skill, this ability, when cast, will temporarily increase the HP of yourself and people around you by an additional 2%. So, with this skill Mastered, you will be able to cast this skill, and temporarily increase your HP by 20%, as well as the HP of anyone else around you. Having to recast this skill to keep the HP increase up might be tedious, but an extra 1/5th of your already massive HP total is too good to pass up. I still need to  Latale Ely personally test the shouts out, to see how viable they are compared to other skills.

Bravery Shout: Available at Level 20, Upgradeable 10 levels, requires Encouraging Shout Level 5 or greater. For each skill point that you invest into this skill, when you cast this skill, the Physical Damage and Magical Damage stats of yourself and players around you will rise by 2 points each. So, with this skill mastered, you can cast this skill to increase the Physical and Magical Damage of yourself and players around you by 20 points.
Personally, I prefer percentage-based abilities over point-based ones. However, keep into mind that Knuckle Knights usually kill enemies in multiple hit combos. Think of a 99 hit combo. Now, add 20 damage to each hit. That's an extra 1980 damage there. This skill will fade into obscurity at later levels, but if you don't mind a skill reset in the distant future, then try this skill out! At the very least, it will make running the latest instant dungeons easier.