Edicts: The cavalier must devote himself to protecting Karrnath and its people. He must obey the commands of King Kaius without question. He must strive to improve Karrnath's reputation and the organisation of its undead forces.
Some bone knights serve the Order of the Emerald Claw, and instead swear allegiance to Vol.
Challenge: Whenever an order of the bone knight cavalier issues a challenge, his allies receive a +1 circumstance bonus on damage rolls against the target of his challenge whenever he is threatening the target. This bonus increases by +1 for every four levels the cavalier possesses.
Skills: An order of the bone knight adds Knowledge (religion) (Int) and Knowledge (nobility) (Int) to his list of class skills. An order of the bone knight cavalier can make Knowledge (religion) skill checks untrained. If he has ranks in the skill, he receives a bonus on the check equal to 1/2 his cavalier level (minimum +1) when the check involves undead.
Order Abilities: A cavalier belonging to the order of the bone knight gains the following abilities as he increases in level.
Channel Negative Energy (Su): At 2nd level the cavalier gains the ability to channel negative energy as an evil cleric of his class level, regardless of his alignment. If he possesses the ability to channel energy from another source (even indirectly, such as via a paladin's lay on hands) it changes to channel negative energy.
Bonecraft (Ex): At 8th level the cavalier is capable of crafting bonecraft weapons and armor. These items function as steel items of the same kind, except that they are non-metallic (and thus immune to effects such as chill metal and a rust monster's touch) and can only be used by a character with the ability to craft them. Bonecraft weapons deal +1d6 damage to living creatures (ranged weapons bestow this property on their projectiles). Bonecraft armor grants the wearer a +4 bonus on Intimidate checks, and DR/bludgeoning based on its weight (DR 1 for light, 2 for medium or 3 for heavy, +1 for every four levels thereafter). After they have been crafted, these items may be enchanted as normal. If he activates the Armor of Bones oracle revelation while wearing bonecraft armor, the bonuses from that ability are halved (round up) but stack with those provided by his armor.
Exoskeleton of Undeath (Ex): At 15th level the cavalier's bonecraft armor fuses to his body, and cannot be removed without killing him. He gains immunity to death effects, disease, paralysis, poison, sleep, stunning, ability penalties, ability damage, ability drain, energy drain, fatigue, exhaustion and nonlethal damage. If he is already undead his turn resistance increases by +4.