Blade Hunter

Blade Hunter Rogues have the ability to do massive amounts of burst damage to targets, but conditions must be met.

All Assassination abilities require the BHR to have Sneak Attack readily available.

Phantom / Implacable

Phantom:

Just before combat, you can become Stealthed to all enemies more than 5ft away from you. You must perform a Stealth check, DC15 to receive this bonus.

Being ambushed, surprised by a foe, or having any enemy entering the 5ft radius, ends your stealth.

Any attack action ends your stealth. 

This consumes a Bonus Action on your first move. You may choose to skip it, and retain the action, but lose the stealth.

It lasts until the end of your first turn, regardless of whether or not you attack.

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Implacable:

A successful attack on an enemy causes the first attack against you from them, to have Disadvantage.

Shadow Assault

You immediately teleport to a target within movement range, ending any Stealth you had.

From there, you may attack with your equipped weapons. Your hit roll is critical when your natural hit roll is 15 or higher.

To use this, you must be Stealthed.

Ghostwalker

 You can Sprint while Stealthed, and keep it, but you have to roll Stealth again when moving within 10ft of an entity.

Subdue

At the 13th level, you can Subdue a creature, forcing it to fall into Unconsciousness.

To do this, you must be Stealthed.

The target must perform a CON Save, DC15. or be rendered unconscious. 

Clutch

At level 17, you may throw a volley of 3 daggers at a target that is guaranteed to hit. Each dagger applies it's damage, with a critical threshold being a natural roll of 10+.

Requires you to have at least 3 daggers in your inventory. If you have less, you simply throw what you have.

This is only usable once, and cannot be used again until a Long Rest.