Through years of misuse, makeshift repairs with whatever materials were available and constant use, it is a rusty, highly stylized suit of power armor. The left arm of the suit was replaced with the sleeve and glove of the raider iconoclast armor, a brahmin skull substituted for the left pauldron and various bits and pieces of metal were used to patch holes in the structure of it.
It is aesthetically identical to Ashur's power armor. Everett notes this as being intended by the armor's designers. Pitt natives came to see Ashur as a god, and made this set of armor to emulate the way their god looked. It was one of the original suits of power armor worn by the Brotherhood of Steel. While they are identical in design, their effects vary.
The following is a comparison of Ashur's power armor and the tribal power armor.
Because of the net gain in APs and Luck, this armor is suitable for gunslingers as well as those who prefer melee in combination with V.A.T.S.. In comparison, Ranger battle armor grants 5 AP, no Strength bonus, and a Small Guns boost that becomes obsolete when the player's skill is maxed.
However, tribal power armor suffers a lower DR, and requires Power Armor Training. Marksmen who prefer free aim will benefit more from other types of power armor. For lower-level Small Guns specialists, Ranger battle armor can be used immediately, boosts your skill, and should have a lower Sneak penalty.
This armor may be the best choice for V.A.T.S. focused players, however, a player should also consider Lag-Bolt's combat armor instead to gain an additional 3 DR while only losing 5 AP (3 AP net due the Agility penalty).