What do you think about this kit?

I'm currently creating this kit, and I wanted to hear what people thought about it, mostly from the balance part, and maybe some ideas to give the kit interesting Lore.

THUNDERFIST: These powerful warriors are trained not to rely on any weapon but those their body already provides—fists—and to channel the power of Lightning throughout them and their body. Because of their intense training to master the Way of the Thunder, they gain resistances to breath weapons and have innate skills to dodge ranged attacks. These Monks are unusual in Faerun, and their origin of their Order is said to be tied to other Planes as well.

Advantages:
— +10% to Move Silently and Hide in Shadows.
— Receives a +2 to Saving Throws vs. Breath Weapons.
— Gains -1 to Speed Factor every 5 levels, starting at level 1 (max. -4 at level 15).
— May get different High Level Abilities than other Monks.
— May use the Spiritual Thunderstorm ability once per day. Gains one use at level 1.
— May use the Thunder Strike ability once per day. Gains one use at level 5 and an additional use every 5 levels thereafter.
— May select the Storm Stance fighting form, starting at level 1.
— May select the Lightning Stance fighting form, starting at level 5.
— May select the Spark Stance fighting form, starting at level 10.
— May make 3/2 unarmed attacks per round. An Additional 1/2 attack per round is gained every 5 levels. The Lightning Damage shown here is only dealt when the Storm Stance fighting technique is being used. Damage dealt by unarmed attacks increases with level as follows:
Level 1-2: 1d6 Crushing, +1 Electrical Damage every 3rd strike
Level 3-5: 1d8 Crushing, +2 Electrical Damage every 3rd strike
Level 6-8: 1d10 Crushing, +2d2 Electrical Damage every 3rd strike
Level 9-14: 1d12 Crushing, +2d4 Electrical Damage every 3rd strike
Level 15-24: 1d20 Crushing, +2d6 Electrical Damage every 3rd strike
Level 25+: 1d20 Crushing, +3d8 Electrical Damage every 3rd strike
— Gains a +1 bonus to AC Modifier vs Missile weapons every 5 level, starting at level 1.
— Gains a +1 bonus to AC every 5 levels, starting at level 1.


Disadvantages:
— Alignment restricted to neutral.
— May not use any other weapon that own fists and feet.
— Does not gain any additional Saving Throw bonuses from the Monk class.
— Does not gain additional Speed Factor bonuses at levels 8 and 12.
— Does not gain additional Movement Speed bonuses from the Monk class.
— May not gain any Magic Resistance nor special immunities from the Monk class.
— Gains AC and AC Mod. vs. Missiles every 5 levels instead of 2 and 3 respectively.
— May not spend points in the Find Traps skills.
— May not spend any points in Fighting Styles nor Weapon Proficiencies.
— May not use the Lay on Hands ability.
— May not use the Stunning Blow ability.
— May not use the Quivering Palm ability.

SPIRITUAL THUNDERSTORM: Damages nearby enemies by 1d4 points of Electrical Damage per level (max. 20d4 at level 20) and lowers their AC by 2 every 5 levels (max. -10 at level 20).

THUNDER STRIKE: The first strike damages nearby enemies with Lightning Damage for 1d4/level for every level after level 5 (max 15d4 at level 20).

STORM STANCE: The monk draws the power of Lightning from his inner self and reflects it upon his fists. Every 3rd strike, the Monk knocks the target back (no save) and Stuns them for 1 round (save vs. spell at +2, minus 1 every 5 levels, max. -2 at level 20) and deals extra Lightning damage as noted before. Also, the Thunderfist is Hasted for 1 round after the 3rd strike happens.

LIGHTNING STANCE: The Monk gains the speed of Lightning. blows now deal 1d4 slashing damage plus 3 lightning damage, and the Monk becomes Hasted, movement speed doubled and gaining one extra attack per round.

SPARK STANCE: The Monk becomes one with the Thunder and transforms into a spark, gaining 5% Lightning Resistance/level (max. 125 at level 25), and an electrical shield for 2d4 damage to anyone that hits , besides becoming immune to Slow and Normal Weapons. There is, however, one big drawback: The Monk may only attack once per round for 1d3 Lightning damage.

Mind that: this kit doesn't gain the immunites, Magic Resistance and insane AC bonus other Monks do, hence the higher damage output. Tell me what do you people think on this and thanks in advance.