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Lumerius key art Path of Exile 2
While sources of Spirit are somewhat scarce, players can increase their maximum Spirit in three main ways. Killing specific bosses in the Acts will drop permanent Spirit upgrades, certain pieces of equipment can grant players additional spirit while equipped, and, in rare cases, a character’s Ascendancy Class can even grant them additional spirit for a unique cost.
Spirit in the Acts
Path of Exile 2 Executioner boss
Each Act in the campaign features a boss that rewards players with a gemmed skull, permanently increasing the player’s maximum Spirit by 30. During early access, these rewards will be dropped even during the player’s second time through the Acts on Cruel difficulty, giving players that find all of them 180 Spirit.
Certain gear can increase the player’s maximum spirit while equipped. All sceptres passively increase the player’s maximum Spirit by 100 when equipped, making them powerful sources of the relatively scarce resource. Additionally, some sceptres grant players passive effects that do not reserve any Spirit, such as a free minion or aura effect. Similarly, Sun Amulets grant a small amount of spirit, though at a much smaller range of 10 to 15. Additionally, certain magic and rare items can randomly roll prefix modifiers to increase the Spirit granted from the item by a percentage. Players looking to maximize their Spirit will want to craft primarily on sceptres, before moving on to amulets if needing more.
While rare, as of early access, there are two Ascendancy Classes featuring Spirit-increasing nodes: the witch’s Infernalist and the monk’s Invoker.

The Infernalist Ascendancy offers poe2 currency the Beidat’s Will node, reserving 25% of the player’s life, but granting players 1 maximum Spirit for every 25 maximum life they have. While the 25% life reservation can be a steep cost to pay, the prerequisite node, Altered Flesh, can help offset this induced fragility by converting a portion of cold, lightning, and physical damage received into fire and chaos damage. Additionally, Infernalists will likely want to invest into maximum life or life recovery regardless of the Beidat’s Will node to offset the self-damage inflicted by their Demon Form or Infernal Flame mechanics.
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If you want to know more, you can read this article: Path of Exile 2: How to Increase Your Spirit