Book of Insight

The Book of Insight

The Book of Insight is accessible between campaign missions. In it you can spend Knowledge Points to improve units or the citadel, unlock new pieces, or give new passive or active abilities or Iris. Purchased skills can be refunded at any point.

Certain skills require a higher Expedition Level before they can be unlocked. Level II (Prodigy) requires 5 Knowledge Points and Level III (Master) requires 10 Knowledge Points.

In Endless Mode the Book of Insight is not available and instead skills are bought using points.

Citadel

Citadel skills improve the citadel.

Skill	Effect	Type	Expedition Level
Perla Escape	Iris automatically teleports to the Citadel when her health is low	Passive	Bookworm
Headquarters Defense	Generates a field of damage that hurts all Horrors near the Citadel	Active	Bookworm
Reinforced Stonework	Citadel gains +250 health	Passive	Prodigy
Mistleap	Teleports all units in the arte's field to the Citadel	Active	Master

Units

Units skills improve the attacks of one the units.

Skill	Effect	Expedition Level
Bowman: Menelaus Shot	Bowman attacks 3 horrors at once.	Bookworm
Lobber: Powder Ball	Lobber attacks hit a larger area	Bookworm
Captor: Pearl Web	Captor attacks stun horrors	Prodigy
Cannoneer: Volatile Cannonball	Cannoneer attacks hit a larger area	Prodigy
Ballista: Cluster Bomb	Ballista attacks hit a larger area	Master
Hunter: Execution	Hunter attacks instantly kill low-health enemies	Master

Pieces

Pieces skills unlock new pieces.

Skill	Unlocked pieces	Expedition Level
Advanced Stone Pieces	Stone Rampart, Stone Arches and 1x3 Stone Brick Mounted Fire Arrows, Mounted Poison, Mounted Hell Arrows and Mounted Hell Poison specialist boosts	Bookworm
Advanced Wood Pieces I	Wood Scaffold and 1x3 Stone Strut Mounted Banner and Grand Mounted Banner general boosts	Prodigy
Advanced Wood Pieces II	Claw Trap	Master

Iris

Iris skills improve Iris' capabilities and unlike other skills they come in mutually-exclusive groups of two as well as two levels each.

Skill	Effect	Type	Expedition Level	Excludes
Perla Attack	Iris gains a basic attack	Passive	Bookworm
Arte: Palido Darts I	Iris' attack strikes up to 4 horrors and deals 30 damage	Passive	Bookworm	Arte: Palido Impact
Arte: Palido Impact I	Iris' attack deals 36 damage	Passive	Bookworm	Arte: Palido Darts
Arte: Sunderbolt I	Deals damage in one attack in a large area	Active	Bookworm	Arte: Tempest
Arte: Tempest I	Deals damage in multiple attacks in a large area	Active	Bookworm	Arte: Sunderbolt
Leather Undershirt	Increases Iris' health	Passive	Prodigy
Arte: Healing Veil I	Reduces damage to buildings and restores health to buildings	Active	Prodigy	Arte: Pounding Veil
Arte: Pounding Veil I	Slightly reduces damage to buildings and damages horrors in the area	Active	Prodigy	Arte: Healing Veil
Arte: Palido Darts II	Iris' attack strikes up to 7 horrors and deals 30 damage	Passive	Prodigy	Arte: Palido Impact
Arte: Palido Impact II	Iris' attack deals 48 damage	Passive	Prodigy	Arte: Palido Darts
Arte: Sunderbolt II	Deals damage in one attack in a large area and inflicts Stunned and Burning	Active	Master	Arte: Tempest
Arte: Tempest II	Deals heavy damage in multiple attacks in a very large area	Active	Master	Arte: Sunderbolt
Arte: Healing Veil II	Greatly reduces damage to buildings and restores health to buildings for a long time	Active	Master	Arte: Pounding Veil
Arte: Pounding Veil II	Slightly reduces damage to buildings and damages horrors in the area for a long time	Active	Master	Arte: Healing Veil
Chainmail Undershirt	Increases Iris' health	Passive	Master