Leveling up in Path of Exile 2 naturally grants Passive Skill Points, but that's not the only way to strengthen your character during the campaign. By completing specific side quests, defeating optional bosses, and finishing certain trials, you can earn additional Passive Skill Points in the form of the Book of Specialization.

Below is a complete, Act-by-Act breakdown of every bonus Passive Skill Point source in Path of Exile 2, including where to find them and what to watch out for.

How Bonus Passive Skill Points Work in Path of Exile 2

Bonus Passive Skill Points are awarded through the Book of Specialization, which does two things:

·Grants additional Passive Skill Points

·Increases your Weapon Set Skill Points, enabling more flexible weapon-swap builds

Each Book is earned by completing a specific objective, usually tied to an optional boss or side quest. While none of these are mandatory to complete the campaign, skipping them will leave your character underpowered later.

Act 1 Bonus Passive Skill Points

The Crowbell

Location: Hunting Grounds

Defeat the Crowbell side boss in the Hunting Grounds. This encounter is dangerous for early characters, as its slam attack can one-shot low-defense builds. Keep moving and avoid staying in front of the boss for too long.

Una's Lute

Location: Ogham Farmland

Travel from the Hunting Grounds to Ogham Farmland and search the huts scattered throughout the area. The Lute can spawn in multiple locations, so expect some exploration. Once found, turn it in to receive your Book of Specialization.

Act 2 Bonus Passive Skill Points

Kabala, Constrictor Queen

Location: Venom Pit

Kabala is an optional boss found while exploring the Venom Pit. Defeating her drops a Book of Specialization directly. Her arena features dangerous area attacks, but you can avoid much of the damage by repositioning frequently.

Tradition's Toll

Location: Desert Regions

After progressing through the Sandstorm, speak to Shambrin to begin the side quest. She asks you to locate someone who ventured ahead into Deshar. You can actually obtain the quest item before speaking to her, saving time if you're exploring thoroughly.

Act 3 Bonus Passive Skill Points

Mighty Silverfist

Location: Jungle Ruins

Avoid backward dodges; sidestep to avoid lethal slams. Drops often include Path of Exile 2 Items useful for minion or caster builds.

Aggorat

Location: Vaal Portal Area

After traveling through the portal in Act 3, Vaal Goliaths can drop a Sacrificial Heart. Take this heart to Aggorat and interact with an Altar using a Sacrificial Dagger. This unlocks the encounter and rewards a Book of Specialization.

Act 4 Bonus Passive Skill Points

Dark Mists

Location: Kedge Bay / Kingsmarch

Free Freya Hartlin, then defeat Omniphobia, Fear Manifest in Kedge Bay. Once completed, return to Kingsmarch and speak with Tujen to claim your reward. Prior to patch 0.4, this reward came from a different boss, but Omniphobia now holds the bonus point.

Trial of the Ancestors

Location: Halls of the Dead

Completing this trial grants two Passive Skill Points, making it one of the most valuable objectives. Reward items can be sold or traded for Path of Exile 2 Currency, allowing you to buy POE2 Items.

Interlude Bonus Passive Skill Points

Oswin, the Dread Warden (Interlude 1)

Location: Wolvenhold

Travel to the Wolvenhold side area and defeat Oswin. Watch for spikes erupting from the floor during the fight, as they deal heavy damage if you remain stationary.

Akthi and Anundr (Interlude 2)

Location: Khari Crossing

Speak with Risu, who will task you with defeating a dangerous boss duo. Akthi and Anundr must be fought simultaneously, so crowd control and positioning are key.

The Abominable Yeti (Interlude 3)

Location: Howling Caves

This encounter closely resembles the Mighty Silverfist fight. Avoid frontal attacks and manage spacing carefully. After defeating the Yeti, speak with Hilda to receive your Book of Specialization.

The Hooded One

Requirement: Complete all three Interlude storylines

After finishing Interludes 1-3, speak to the Hooded One to claim the final set of bonus Passive Skill Points.

Speed-Leveling Tip for Bonus Skill Points

If you're speed leveling in Path of Exile 2, you don't need to claim NPC rewards immediately. Complete the quest objectives while progressing naturally, then collect multiple rewards the next time you return to a hub area. This minimizes backtracking and saves significant time.

Final Thoughts

With 24 bonus Passive Skill Points available during the Path of Exile 2 campaign, skipping these objectives can leave your build noticeably weaker. Whether you're planning a weapon-swap setup or simply want more flexibility in the passive tree, these Books of Specialization are well worth the effort.