Bloodstone was written for AD&D 1st Edition. Assassins are used rather frequently as opposition. In fact, the leader of the opposition is named the Grandfather of Assassins.
Below is my take on what it would take for the Grandfather of Assassins to rise to his current power. I did draw initial inspiration from Luke Crane’s Jihad: Burning Sands, the H-Series of Bloodstone, and the OSRIC reference document.
|Initiate of the Brotherhood||4 yrs||5||+1P||City,Village, Servitude, Military|
|Skills: 7 pts: Cooking, Repair, Climbing, Swimming, Apothecary, Trap-wise, Crossbow Training|
|Traits: 2 pts: Quiet, Bitter, Cynic, Nimble|
|Initiate of the Brotherhood is considered a Poisoner and/or Desperate Killer for purposes of Lifepath selection.|
|Brother of Assassins||5 yrs||10||+1M/P||Any|
|Skills: 7 pts: Inconspicuous, Stealthy, Poisons, Knives, Disguise, Falsehood, Picking Lock|
|Traits: 1 pt: Merciless, Cold-Blooded, Hard-Hearted|
|Brother of Assassins requires Initiate of the Brotherhood|
|Father of Assassins||5 yrs||15||+1M/P||Any|
|Skills: 7 pts: Greathall Tunnel-wise, Assassin-wise, Extortion, Intimidation, Sword, Observation, Persuasion|
|Traits: 1 pt: Arrogant, Prominent Scar, Precision Training|
|Father of Assassins requires Brother of Assassins.|
|Grandfather of Assassins||7 yrs||25||+1M,P||Any|
|Skills: 8 pts: Command, Fortress-wise, Noble-wise, Sorcery-wise, Logistics, Oratory, Strategy Games, Strategy; General Skills: 1pts|
|Traits: 1 pt: Calm Demeanor, Domineering Presence|
|Grandfather of Assassins requires Father of Assassins.|
Additional Lifepaths can be found at the Burning Wheel Wiki.