The fey teach that there are greater treasures to steal than a
coin pouch, and you've learned well. Sídhe rogues delight in
tricking the foolish, often tailoring the trophies they thieve to
play jokes on their victims—taking the beauty of the vain, or
the voice of the obnoxious.
Sídhe Thief
Starting at 3rd level, when you use your Sneak Attack against a creature, you can use your bonus action to steal a treasure from that creature, choosing from the following options:
Sight. You become invisible to that creature until the start of your next turn, or until you attack or cast a spell.
Voice. Until the start of your next turn, the creature can't speak. If the creature attempts to cast a spell with a verbal component, roll a d20. On an 11 or higher, it can't cast the spell, and any expended spell slots aren't consumed.
Youth. The creature ages a number of years equal to the extra damage dealt by your Sneak Attack, and its speed is reduced by 10 feet until the start of your next turn. This feature can't cause a creature to die from old age, and its age returns to normal at the start of your next turn.
Your DM might allow you to steal an alternative treasure from the creature. An alternate effect should be no more powerful than the effects described above, and the DM has the final say on such an effect.
Faerie Speech
Also at 3rd level, you learn to speak, read, and write Sylvan. Additionally, you can use your thieves' cant while speaking Sylvan. While speaking in this way, you can convey messages in thieves' cant at a normal speed, and only a creature that knows both languages understands your message.
Glamour
At 9th level, you learn to reshape yourself with faerie glamour. As an action, you can transform your appearance, which lasts until you use your bonus action to revert to your true form. If you change your height and weight, you can make yourself Small or Medium, but no larger or smaller. You can make yourself appear as a member of another race, though none of your statistics change, and your basic shape remains the same. Otherwise, the extent of the change is up to you, including your voice, colouration, and sex.
You can transform the appearance of your armour and clothing to suit your new size and shape, though its bulk, weight, and effects remain the same. The armour or clothing returns to normal when you revert to your true form, or if you remove it.
Name Thief
Beginning at 13th level, you can use your action to steal the name of another humanoid you can see within 60 feet of you whose name you know. The creature must make a Wisdom saving throw (DC 8 + your Charisma modifier + your proficiency bonus). On a failed save, you steal the creature's name for 1 hour, or until you return it as a bonus action.
A creature without a name isn't recognized as itself. Any creature interacting with it regards it as a total stranger, and has no recollection of knowing it. A creature that uses its action to examine the nameless creature can connect it to its name with a successful Wisdom (Insight) check against your passive Charisma (Deception). On a success, that creature realizes the nameless creature's true identity.
When you use your Glamour feature while you have a creature's name, you can perfectly mimic that creature's appearance and you gain a +10 bonus to Charisma checks you make to imitate it and its mannerisms.
On a successful save, you can't use this feature on that creature again until you finish a long rest.
Aos Sí
By 17th level, you can truly sever a creature from what was once theirs. When you steal a treasure from a creature using your Sídhe Thief feature, it remains stolen until you steal the same treasure from another creature, until you return it as a bonus action, or until you die.
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