Grunt Style

Dwarves tend to have a fairly small number of fighting styles, and most dwarves use the same fighting style as the rest of the army. It's not that there are no creative forms amongst the dwarves, it's far most that the dwarves tend to use the single traditional style.

Non-dwarves tend to be bad at that style, mostly due to not having access to dwarven made weapons or armour, but they definitely not secret, and any dwarven soldier will teach "how to fight properly".

Exponent	Form	Fight Actions
2	Axe	Strike, Block, Push, Charge, Beat
3	Hammer
4	Mace
5	Polearm

Techniques	Training Obstacles
Heavy Soldier	Instruction Ob 1	Soldiering Ob 1	Grunt Ob 1
Armour Training.
Host Training	Instruction Ob 1	Soldiering Ob 2	Grunt Ob 2
Skirmish Training.
Advanced Host Training	Instruction Ob 2	Soldiering Ob 2	Grunt Ob 2
Battle Training.
Advanced Heavy Soldier	Instruction Ob 2	Speed Ob 2	Grunt Ob 2
Shield Training.
Heavy Hitter	Instruction Ob 3	Power Ob 3	Grunt Ob 3
Gain the Great Strike action.
Percision Hitter	Instruction Ob 4	Agility Ob 3	Grunt Ob 3
Gain the Disarm Action.
Overpower	Instruction Ob 4	Power Ob 4	Grunt Ob 4
Gain the Lock action.

This art's basic forms are taught to anyone who would ask, but none of the techniques are taught outside the guild. Like all guild secrets, a sufficient bribe can get someone who attempts to learn them off with a beating.