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If Osty is alive, he deals 9 damage to ALL enemies and you gain 9 Block.
Osty dies.
Bone Shards acts as a versatile emergency button, converting your current Summon investment into immediate AOE damage and Block. It is best used in decks that can rapidly re-summon Osty or those looking to trigger specific 'on death' effects for massive damage spikes.
Necro Mastery
Killing Osty with Bone Shards triggers the loss of his current HP, which Necro Mastery converts into equivalent damage to all enemies. This combo can result in a massive board clear if Osty has a high HP pool before being shattered.
Reanimate
The main downside of Bone Shards is the loss of your companion, which Reanimate solves by providing a huge 20 Summon instantly. This allows you to cycle Osty's life for value without losing your defensive layer for more than a single card play.
Bound Phylactery
This relic ensures that Osty is automatically summoned at the start of every turn. It mitigates the risk of using Bone Shards by guaranteeing your companion returns for free, keeping your Osty-dependent cards active.
Bone Flute
Since the damage from Bone Shards is technically dealt by Osty, it triggers this relic to grant additional Block. This increases the card's efficiency, making it a stronger defensive option while clearing waves.