Stone Mastery

After unlocking your first Stone, according to the Stone Progression System, you have now mastered the use of the Infinity and Eternity Stones, allowing you to channel their immense power according to the following rules:

Stone Infusion Rules:

• Action Economy: A Stone’s effect may only be applied when you expend an action, bonus action, or reaction, as appropriate to the delivery method.

• Method of Delivery: You may deliver a Stone infusion through a ranged attack, melee attack, or touch interaction. Infusions cannot be split across multiple delivery methods.

• Duration: Unless otherwise specified, ongoing Stone effects last until the start of your next turn and function on both magical and nonmagical creatures and objects.

Material Stability:

1. Using a mithral-infused shadowsteel item to deliver a Stone effect:

   • The infusion into that item automatically succeeds.

   • If you attempt to infuse a separate item that is not mithral-infused shadowsteel, you must make a Stability Check (d20) for that infusion.

2. Using a non-mithral-infused shadowsteel item, or delivering without any item:

   • You must make a Stability Check (d20) to safely deliver the Stone effect.

   • If you then attempt to infuse an item that is not mithral-infused shadowsteel, you must make a second Stability Check (d20).

• The DM determines the Stability Check DC, scaling with:

  • Number of Stones infused

  • Whether the item is mundane or magical

  • Size or magnitude of the effect

• On a failed Stability Check, the Stone effect still occurs, but the item may be destroyed, warped, or dangerously altered, and minor backlash may occur at the DM’s discretion.
  
  

Stone Progression System:

Level 1: Unlock One Infinity Stone
Level 2: Unlock One Infinity Stone
Level 3: Unlock One Infinity Stone
Level 4: Unlock One Infinity Stone
Level 5: Unlock One Infinity Stone
Level 6: Unlock Mind Stone
Level 7: Infinity Stones gain Advanced Level Effects
Level 8: Unlock One Eternity Stone
Level 9: Unlock One Eternity Stone
Level 10: Unlock One Eternity Stone
Level 11: Unlock One Eternity Stone
Level 12: Unlock One Eternity Stone
Level 13: Unlock Destiny Stone
Level 14: Eternity Stones gain Advanced Level Effects
Level 15: Unlocks Dual Infusions
Level 16: Unlocks Triune Infusions
Level 17: Unlocks Tetra Infusions
Level 18: Unlocks Quint Infusions
Level 19: Unlocks Hexa Infusions
Level 20: Gain Advanced Level Effects on Multi-Stone Infusions

Special Notes:

• While you are not wielding a Stone, this feat provides no benefit.

• You cannot unlock the Mind Stone until Level 6 or the Destiny Stone until Level 13.