Character
Necrobinder
Card details
Necro Mastery
This page tracks the current Necrobinder power text for Slay the Spire 2, plus the upgraded version, the card's current role in the pool, and a few nearby follow-up reads.
Type
Power
Rarity
Rare
Cost
2
Current rule text
Summon 5. Whenever Osty loses HP, ALL enemies lose that much HP as well.
Upgrade comparison
Base and upgraded Necro Mastery at a glance
Base
Summon 5. Whenever Osty loses HP, ALL enemies lose that much HP as well.
Upgraded
Summon 8. Whenever Osty loses HP, ALL enemies lose that much HP as well.
Related cards
More Necrobinder cards worth checking next
Afterlife
Summon 6. Exhaust.
Banshee's Cry
Deal 33 damage to ALL enemies. Costs Energy Energy less for each Ethereal card played this combat.
Blight Strike
Deal 8 damage. Apply Doom equal to damage dealt.
Bodyguard
Summon 5.
Bone Shards
If Osty is alive, he deals 9 damage to ALL enemies and you gain 9 Block. Osty dies.
Borrowed Time
Apply 3 Doom to yourself. Gain Energy .
Next reads
Put this card back into deckbuilding context
All cards
Go back to the full card wall when you want to compare names, costs, or neighboring picks in the same pool.
Characters
Use the roster hub when you want bigger class context than one card can give you.
How Doom works
Follow this page when you want the mechanic or guide context that makes this card easier to evaluate mid-run.
Necrobinder guide
Follow this page when you want the mechanic or guide context that makes this card easier to evaluate mid-run.
Sources
Mega Crit early access launch post
OfficialOfficial launch article for the current early access build.
Neowsletter: Necrobinder and Doom
OfficialOfficial explanation of Osty, Doom, Souls, and card transformation.
Untapped Slay the Spire 2 card library
AuthorityUsed as a secondary authority for the currently visible Early Access card pool and card art indexing.