Brain Leech event art, Slay the Spire 2

Brain Leech

*thunk*

A sharp pain is felt atop your head and a thought stabs into your mind.

“SHARE KNOWLEDGE???”

You are unsure how to proceed...
“HOW OSTENTATIOUSLY SCHOLASTIC OF A LABYRINTHINE MIND!
A VERITABLE CORNUCOPIA OF CEREBRAL SUSTENANCE TO DIGEST!”.

Satisfied, the creature pops off and crawls away.
You are flabbergasted.
You violently rip the leech off your head and chuck it far far away!

There's a voice in your head:
“NOOOOOOoOoooooOOOOoooo....”
Individual choiceEach player picks their own

What you can obtain

Card
1 of 5 randomChoice: Share Knowledge
Card
Colorless rewardChoice: Rip the Leech Off

Where it appears

How ? rooms roll ›
Act 1OvergrowthAct 1UnderdocksAct 2Hive

What each choice does

Share Knowledge

Choose 1 of 5 random cards to add to your Deck.

Card1 of 5 random cards
What the game says
“HOW OSTENTATIOUSLY SCHOLASTIC OF A LABYRINTHINE MIND!
A VERITABLE CORNUCOPIA OF CEREBRAL SUSTENANCE TO DIGEST!”.Satisfied, the creature pops off and crawls away.
You are flabbergasted.

Rip the Leech Off

Lose 5 HP. Gain a Colorless card reward.

HP−5CardA Colorless card reward
What the game says
You violently rip the leech off your head and chuck it far far away!There's a voice in your head:
“NOOOOOOoOoooooOOOOoooo....”

Which option to take

Share Knowledge

Our pick
Card1 of 5 random cards
  • Share Knowledge is a free card reward with five choices instead of three, so take it while you still want cards; the only catch is that you cannot leave empty-handed.

Rip the Leech Off

HP−5CardA Colorless card reward
  • Rip the Leech Off when the deck is tight and a colorless card is what you actually want, or when you would rather keep the right to skip; 5 HP is cheap in Act 1 and still fine in Act 2.

How it plays

  • Share Knowledge rolls 5 cards from your character's pool with normal reward odds (commons most likely, no upgrade roll) and shows them in a grid; you must take one, the screen cannot be cancelled.
  • Rip the Leech Off deals 5 damage that ignores Block and powers, then opens a standard colorless card reward with 3 choices, which you may skip.

Changes by version

  1. 11 Sep 2025Bug fixInternal playtest
    Fixed a typo in Brain Leech event
  2. 4 Sep 2025TextInternal playtest
    Updated wording for Brain Leech event for clarity
  3. 27 Aug 2025RarityInternal playtest
    Now uses card reward Rarity odds when you pick the Share Knowledge option
All 4 patch notes1 older
  1. 21 Aug 2025ChangeInternal playtest
    Changed Brain Leech (formerly Brain Bug) event: can now appear in Act 1a and Act 1b as well
    TextInternal playtest
    Brain Bug to Brain Leech
    TextInternal playtest
    Updated text

Internal playtest notes are from before the Early Access release. Names and numbers in them can differ from the game today.

Purchase today
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