Lesser Invocations
Abhorrent Speech You can communicate with horrible creatures (aberrations, undead, etc.).
Beguiling Influence (1/day) You may reroll an Influence check.
Blood Sight (1/day) You may reroll an Examination check. Additionally, you can detect traces of blood on a surface, even after it has been cleaned.
Devoted Acolyte Learn 2 of the following languages: Celestial, Draconic, Deep Speak, Infernal, or Primordial. Advantage on Lore checks related to those 2 languages.
Eldritch Sense You can sense the presence of any shapechanger or creature concealed by magic while within 6 spaces of them.
Gaze of Two Minds Touch a willing creature and perceive through its senses instead of your own for as long as you hold concentration.
Knowledge from Beyond Whenever you fail an Insight or Arcana check, you may suffer 1 Wound to succeed instead.
My Favored Pet One shadow minion can begrudgingly tolerate you outside of combat. It can (very creepily) do any menial task a below average commoner could.
Voice of the Dark You can communicate telepathically with a humanoid within 6 spaces.
Whispers of the Grave (1/day) You can ask a dead creature 3 yes/no questions. It can never be questioned this way again.
Greater Invocations
Armor of Shadows Reduce all damage you receive by an amount equal to the number of minions you have.
Fiendish Boon Increase your DEX or INT by 1. You have 1 fewer maximum Hit Dice.
Hungering Shadows Whenever one of your shadows would crit, the next tiered spell you cast this encounter does not cost a use of Pilfered Power.
One with Shadows Action: When you are in an area of dim light or darkness, you may become Invisible until you move or attack.
Repelling Blast When you hit a Medium or smaller creature with Shadow Blast, you can push the creature up to 2 spaces away from yourself.
Shadow Magus Your minions gain +4 Reach and deal d10 damage instead.
Shadow Spear Your Shadow Blast can target creatures twice as far away, it ignores cover, and you may attack Prone targets with advantage with it (instead of disadvantage).
Shadow Rush When your shadow minions attack, instead of rolling damage, you may have any of them deal the max amount, then die.
Shadow Warp Action: Switch places with a creature within 12 spaces that has been dealt necrotic damage this turn.
Swarming Shadows Whenever one of your shadows would crit, summon another shadow minion adjacent to the target.
Vengeful Blast Whenever a minion dies, you may cast Shadow Blast as a reaction (even if you already cast it this turn).