Homemade Prestige Class: Legionary

While I still try to come up with an angle for this blog, here's a custom-made prestige class I drew up for a campaign I did some time ago. I really enjoyed playing the class. I'm sure something like it probably already exists somewhere, but I haven't find one yet.

I wasn't thinking of it at the time, but now that I think about it this class could be re-named Spartan.

Legionary

A 10 level prestige class with Fighter in mind as the base class. It has a slower bonus feat progression (3 over the course of 10 levels instead of 5) but gains additional offensive and defensive uses of a shield.

A Paladin could easily become a viable Legionary as well, but I left out the ability to multiclass freely between the two classes on purpose (Legionaries are a martial class (basically specialized Fighters) and a Paladin would face the same restrictions as if multiclassing Fighter).

Requirements:
Proficient with all martial weapons, heavy armor and shields
Endurance and Improved Shield Bash feats
Base attack +5
Must be lawful

Class skills and skills per level are same as a Fighter's
Hit die are d10s
Good base attack progression and good fort saves (as Fighters)

Bonus feats: Legionaries select bonus feats from the Fighter bonus feat list. They gain one at every 3rd level (3, 6 and 9).

Impenetrable Wall: Starting at 1st level, whenever a Legionary is wielding a heavy or tower shield and is adjacent to an ally who is also wielding a heavy or tower shield, they both gain an additional +1 shield bonus to their AC. At 4th level this bonus becomes +2, at 7th level it becomes +3 and at 10th level it becomes +4.

Sword and Board: At 2nd level a Legionary gains the Two-Weapon Fighting feat. At 6th level he gains Improved Two-Weapon Fighting and at 10th level he gains Greater Two-Weapon Fighting. He does not need to meet the normal prerequisites for these feats, but he must be proficient with the weapon in his main hand and using a shield as his off-hand "weapon".

Indomitable: Once per day starting at 4th level, a Legionary may take 10 minus his Con modifier (minimum 1) in minutes of rest to have the effect of a Lesser Restoration on himself. This functions as an extraordinary ability.