Path of Exile 2 Oisín's Oath

Oisín's Oath is a specialized Lineage Support Gem in Path of Exile 2 that fundamentally changes the mechanics of resource sustain for elemental spellcasters. By shifting the source of Mana Leech from Physical to Elemental damage, it allows high-intelligence builds to maintain their mana pools through direct elemental hits. This is an essential utility for endgame casters who previously relied on niche gear or physical weapon damage to sustain their high-mana-cost spell rotations.

Oisín's Oath Lineage Support Gem Stats & Affixes

Basic Stats

• Item Level: 100 | Item Type: Support Gem

• Requirements: Level 65 | Support Requirements: +5 Int

• Mana Multiplier: 100% | Category: Mana Leech

• Tags: Lineage, Spell

Affixes

• Supports Skills which Hit enemies

• Mana Leech from Supported Skills recovers based on Elemental Damage Types instead of Physical Damage

• Cannot Support skills that do not hit enemies

• You cannot have multiple Support Gems of the same Category socketed within one Skill

"The first Warden of Eaves swore to patrol the border twixt the worlds forevermore, so that the tragedy of Gruthkul's stampede would never recur. In time, his vigil on the edge began to... change him."

Oisín's Oath Support Gem Build Synergy

Oisín's Oath is designed for pure spellcasters who deal massive elemental damage but lack a way to recover mana during combat. By converting the leech source to elemental, it rewards high damage output with consistent resource replenishment.

• Tactical Tags: Elemental Leech | Mana Sustain | High-Int Utility | Resource Management

• Class Compatibility: Sorceress / Witch / Druid

• Best Supported Skills (Elemental Hits):

  • Fireball: Allows fire-based casters to sustain continuous bombardment against bosses.

  • Arc: Chain lightning hits now provide a massive surge of mana when clearing packs.

  • Freezing Pulse: Ice mages can maintain their defensive and offensive mana requirements effortlessly.

  • Storm Spear: High-frequency hits translate into rapid-fire mana recovery.

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Path of Exile 2 Oisín's Oath FAQs

• Does Oisín's Oath work with spells like Ignite or Poison?

  No. Mana Leech only triggers from the initial hit of a skill. Damage over time (DoT) effects like burning or poisons do not count as "hits" and will not trigger the elemental leech provided by this gem.

• Can I use this with Physical-to-Cold conversion builds?

  Yes. Once the damage is converted to an elemental type, Oisín's Oath will recognize it and allow you to leech mana based on that converted elemental damage.

• Why is my mana not recovering?

  Ensure your skill actually "hits" enemies. Also, check if you have any modifiers that prevent mana leech or if the enemy has "Cannot be Leeched from" properties.

• Does the 100% Mana Multiplier mean the skill costs more?

  A 100% multiplier means the mana cost remains exactly the same as the base skill. It does not add any additional mana tax to your spell.