Spellcasting. Katya casts one of the following spells, requiring no Material components and using Intelligence as the spellcasting ability (spell save DC 15, +7 to hit with spell attacks):

Firebolt, Message, Blade ward

Shield, Sleep, Comprehend languages, Color Spray, Thunderwave, Alarm

Initiative Proficiency. When you roll Initiative, you can add your Proficiency Bonus to the roll.

Initiative Swap. Immediately after you roll Initiative, you can swap your Initiative with the Initiative of one willing ally in the same combat. You can't make this swap if you or the ally has the Incapacitated condition.

Keen Observer. Choose one of the following skills: Insight, Investigation, or Perception. If you lack proficiency with the chosen skill, you gain proficiency in it, and if you already have proficiency in it, you gain Expertise in it.

Lore Knowledge. Choose one of the following skills: Arcana, History, Investigation, Nature, or Religion. If you lack proficiency in the chosen skill, you gain proficiency in it, and if you already have proficiency in it, you gain Expertise in it.

Quick Search. You can take the Search action as a Bonus Action.

Expertise. Choose one skill in which you have proficiency but lack Expertise. You gain Expertise with that skill (Insight).

Thieves' Cant. Katya learned Thieves' Cant while trying to read House of Leaves. She hasn't gotten a good chance to use it yet, but sometimes writes her annotations in it for fun. Katya can read and write Thieves' Cant, a secret mix of dialect, jargon, and code that allows her to hide messages in seemingly normal conversation. Only another creature that knows thieves' cant understands such messages. It takes four times longer to convey such a message than it does to speak the same idea plainly.