Below are the Ploys available to Blackguards, originally designed by laserllama. If a ploy has a prerequisite, like a minimum Ability Score or level, you can learn it at the same time you meet the prerequisites.

Ploys of this degree represent the absolute peak of blackguard skill that is achievable without dedicated training. 2nd-degree Ploys can be learned by any Blackguard of 5th level or higher.

Prerequisites: 5th level, proficiency with alchemist's supplies
As an action, you can expend one Ploy Die and use your alchemist's supplies to craft a vial of Alchemical Oil, which retains its potency until the end of your next long rest. Upon creation, you choose either acid, cold, fire, or lightning as the damage type for that vial of oil. You cannot regain the Ploy Die spent on this oil until you expend this Alchemical Oil.

Prerequisites: 5th level, Dexterity of 13
As a bonus action, you can expend a Ploy Die to attempt to blind a creature with debris. A creature you can see within 10 feet must succeed on a Constitution saving throw or take piercing damage equal to one roll of your Ploy Die and be blinded until the start of your next turn.

Prerequisites: 5th level, proficiency with poisoner's kit
As an action, you can expend one Ploy Die and use your poisoner's kit to craft one vial of Minor Poison, which retains its potency until the end of your next long rest. However, you cannot regain this Ploy Die until you expend this poison.

Prerequisites: 5th level
When you hit a target with a weapon attack, you can expend a Ploy Die to cripple one of its senses. It must succeed on a Constitution saving throw or it takes additional damage equal to one roll of your Ploy Die and is blinded, deafened, or cannot speak (your choice) until the start of your next turn.

Prerequisites: 5th level, Dexterity of 13
When you hit a creature with a melee weapon attack, you can expend a Ploy Die to strike at a vulnerable area. It must succeed on a Constitution saving throw or it takes additional damage equal to a roll of your Ploy Die, it falls prone, and it cannot take reactions until the start of your next turn.

Prerequisites: 5th level
When you hit a creature with a weapon attack, you can expend a Ploy Die to temporarily weaken it. The first attack made against that creature before the beginning of your next turn has advantage, and on hit, that attack deals additional damage equal to one roll of your Ploy Die.