The Ceaseless Watcher

You have made a pact with the Ceaseless Watcher, also called Beholding and It Knows You. A primordial fear, and the manifestation of the fear of being watched, exposed, followed, and of having secrets known. The Great Eye promises you the ability to know and understand all if you can help to brin about The Watcher's Crown.

Expanded Spell List

The Ceaseless Watcher lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Fiend Expanded Spells

Spell Level	Spells
1st	command, identify
2nd	phantasmal force, zone of truth
3rd	clairvoyance, nondetection
4th	arcane eye, phantasmal killer
5th	legend lore, geas

Understanding

Starting at 1st level, you can spend a turn to learn the creature's Damage Vulnerabilities, Damage Resistances, Damage Immunities, and Condition Immunities.
Once you use this feature, you must finish a short or long rest before you can use it again.

Compulsion

At 6th level, you can cast Zone of Truth without expending a spell slot once per long rest.

Additionally, when using this feature, the connection you have with your patron compels those who fail their Charisma Saving Throw within your Zone of Truth to speak regardless of their will.

Knowing

Starting at 10th level, you are always under the effects of the Detect Thoughts spell. However, if you want to use an action to probe deeper into the thoughts of a creature, you can only do so by expanding a spell slot.

Knowledge Insertion

At 14th level, when you hit a creature with an attack or a spell attack, you can use this feature to instantly force the target into a trance where it lives out its deepest fears. The target is incapacitated until the end of your next turn or they take damage.

When the trance ends naturally the target takes 10d8 psychic damage, or half as much if the trance was interrupted, as it reels from its horrific experience.

Once you use this feature, you can't use it again until you finish a long rest. 

Additionally, this effect also activates when you hit a creature with 4 attacks on your turn. When activated in this way, the use of this feature is not expended.