Book of Insight

The Book of Insight

The Book of Insight is accessible between Campaign missions. In it you can spend Knowledge Points on skills. Skill can improve units or the citadel, unlock new pieces or give new passive or active abilities to 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.

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 I	Generates a field of damage that hurts all Horrors near the Citadel	Active	Bookworm
Reinforced Stonework I	Citadel gains +250 health	Passive	Prodigy
Mistleap	Teleports all units in the arte's field to the Citadel	Active	Master
Headquarters Defense II	Generates a stronger field of damage that hurts all Horrors near the Citadel	Active	Sage
Reinforced Stonework II	Citadel gains +500 health	Passive	Sage

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
Partisan: Mistfuel Grenade	Partisans gain a secondary area attack that removes enamel	Sage

Pieces

Pieces skills unlock new pieces.

Skill	Unlocked pieces	Expedition Level
Advanced Stone Pieces I	1x3 Stone Brick, Stone Rampart, Stone Arches Mounted Fire Arrows, Mounted Poison, Mounted Hell Arrows, Mounted Hell Poison	Bookworm
Advanced Wood Pieces I	1x3 Wood Strut, Wood Scaffold, Mounted Banner, Grand Mounted Banner	Prodigy
Advanced Wood Pieces II	Wood Steps, Claw Trap	Master
Advanced Stone Pieces II	Stone Corner, Mounted Spark, Mounted Hell Spark	Sage

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
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 by 50% and restores health to buildings	Active	Prodigy	Arte: Pounding Veil
Arte: Pounding Veil I	Reduces damage to buildings by 30% 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	Reduces damage to buildings by 100% 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
Arte: Enfeebling Aura	Horrors near Iris suffer more damage from all sources	Passive	Sage

Echo artes

Starting with chapter 12, Iris can use an active ability to summon units with 1 health known as echoes. Echo artes are mutually exclusive and cannot be used in earlier chapters.

Skill	Effect	Expedition Level
Arte: Bowmen Echo I	Summons 2 Bowmen Echo units that last for half of the ability cooldown	Master
Arte: Hunter Echo I	Summons 1 Hunter Echo unit that lasts for half of the ability cooldown	Master
Arte: Bowmen Echo II	Summons 3 Bowmen Echo units that last for two thirds of the ability cooldown	Sage
Arte: Hunter Echo II	Summons 1 Hunter Echo unit that lasts as long as the ability cooldown	Sage