Research and Skills

Research is bought at the building it belongs to: a class’s at its guild, faith’s at the temple, trade’s at the market, knowledge at the library and a castle path’s at the path’s own buildings. The level is that of the best such building standing. It is paid for once and kept for the whole game, also when the building falls.

Researched at	Level	Research	For	Price	What it gives
Market	2	Merchant Guild	All Classes	450	Market income +30%.
Barracks	1	Potion Mastery	Warrior	200	Potions heal 50% more HP.
Barracks	2	Battle Tactics	Warrior	400	Warriors gain +3 ATK.
Barracks	2	Iron Skin	Warrior	400	Warriors gain +2 DEF.
Barracks	3	Warrior’s Resolve	Warrior	800	Warriors gain +20% max HP.
Mage Tower	1	Arcane Affinity	Mage	200	Mages gain +4 ATK.
Mage Tower	2	Arcane Shield	Mage	400	Mages gain +3 DEF.
Mage Tower	3	Elemental Mastery	Mage	800	Mages gain +8 ATK.
Ranger Lodge	1	Keen Eyes	Ranger	150	Rangers see 2 tiles farther through the fog of war.
Ranger Lodge	2	Swift Boots	Ranger	350	Rangers move faster.
Ranger Lodge	3	Bounty Hunter	Ranger	700	Rangers gain 50% more bounty XP.
Guard Post	1	Vigilant Guard	Guard	200	Guards gain +4 defence.
Guard Post	3	Guardian Angel	Guard	800	Guards gain +25% max HP.
Builder’s Guild	2	Sturdy Tools	Builder	300	Builders repair 50% faster.
Thieves’ Guild	2	Poisoned Blades	Thief	300	Thieves’ hits poison enemies, which lose 1% of their max HP every second for 5 seconds. Poison doesn’t stack: a new hit starts it over.
Library	1	Fortified Walls	All Classes	250	All buildings and the castle gain +25% max HP (applies retroactively).
Library	2	Treasure Sense	All Classes	350	Chests drop 50% more gold.
Library	3	Siege Tactics	All Classes	850	+50% damage against enemy strongholds.
Library	3	Hero Training	All Classes	900	Every adventurer gains +15% experience.
Temple	2	Field Medic	All Classes	400	Adventurers resting in buildings heal 50% faster.
Bastion	1	Tower Shields	Shield Knight	300	Shield Knight: +4 defence.
Bastion	1	Shield Impact	Shield Knight	350	Shield Knight: +3 attack.
Bastion	1	Shield Weaving	Shield Knight	450	Shield Knight: Oath Shield +20%, capped at 50% of caster HP; unchanged duration, no stacking.
Wild Camp	1	True Flight	Pathfinder	300	Pathfinder: +4 attack.
Ossuary	1	Deathless Plate	Grave Knight	300	Grave Knight: +4 defence.
Sanctuary	1	Bulwark Drill	All Classes	350	The Bastion shields defenders 5 tiles further out.
Sanctuary	1	Field Surgery	All Classes	400	The Sanctuary and Mending Prayer heal 50% more.
Sanctuary	1	Healer’s Oath	Hospitaller	300	Hospitaller: +3 defence.
Sanctuary	1	Mending Discipline	Hospitaller	400	Hospitaller: own healing +20%; communal healing unchanged.
Sanctuary	1	Healer Mail	Hospitaller	300	Hospitaller: +2 defence.
Beast Lodge	1	Trail Lore	All Classes	300	Heroes explore 15% further from the castle.
Beast Lodge	1	Herbal Remedies	All Classes	350	The town’s inns and temple heal at their full rate again.
Beast Lodge	1	Beast Hides	Beast Warden	300	Beast Warden: +3 defence.
Beast Lodge	1	Pack Training	Beast Warden	450	Living hounds, bears and hawks of a living Beast Warden: +2 attack. No additional summons or upkeep change.
Beast Lodge	1	Warden Guard	Beast Warden	300	Beast Warden: +3 defence.
Crypt	1	Grave Pact	All Classes	350	A summoned guard’s upkeep is halved.
Crypt	1	Marrow Binding	All Classes	400	Each Ossuary keeps one more guard.
Crypt	1	Forbidden Tomes	Necromancer	300	Necromancer: +5 attack.
Constabulary	1	Tax Rolls	All Classes	300	A building’s till holds 50% more.
Constabulary	1	Road Patrols	All Classes	350	A tax collector carries 50% more.
Constabulary	1	Standing Orders	Marshal	300	Marshal: +3 attack.
Toll Post	1	Crossbow Drill	Roadwarden	300	Roadwarden: +4 attack.
War Hall	1	War Drills	All Classes	350	A kill gives its hero 20% more experience.
War Hall	1	Trophy Hall	All Classes	400	A kill pays 15% more gold.
War Hall	1	Blood Oath	Oathsworn	300	Oathsworn: +5 attack.
Quartermaster	1	Banner Guard	Bannerman	300	Bannerman: +3 defence.
Quartermaster	1	Siege Provisioning	Bannerman	500	Supplied Bannermen: +25% wall damage; each blow still consumes one assault supply.
Academy	1	Ley Attunement	All Classes	350	Royal spells cost 20% less.
Academy	1	Runic Binding	All Classes	400	Heroes’ active skills are ready again 15% sooner.
Academy	1	Runed Edge	Spellblade	300	Spellblade: +4 attack.
Spire	1	Focus Crystal	Adept	300	Adept: +5 attack.
Trade Guild	1	Trade Charters	All Classes	350	A caravan’s round trip pays 20% more.
Trade Guild	1	Bulk Buying	All Classes	400	Buildings cost 10% less.
Trade Guild	1	Hired Steel	Escort	300	Escort: +3 defence.
Depot	1	Road-Hardened	Caravaneer	300	Caravaneer: +3 defence.
Depot	1	Freight Contracts	All Classes	350	A caravan’s round trip pays 20% more again.
Tribunal	1	Iron Levy	All Classes	350	The Levy Office loses none of what it seizes.
Tribunal	1	Reign of Fear	All Classes	400	The castle and the arrow towers take 15% less from every hit.
Tribunal	1	Writ of Zeal	Inquisitor	300	Inquisitor: +4 attack.
Levy Office	1	Heavy Mail	Enforcer	300	Enforcer: +4 defence.
Spell Institute	1	Haste	All Classes	300	Heroes of any class may learn Haste at the Spell Institute.
Spell Institute	1	Mending	All Classes	350	Heroes of any class may learn Mending at the Spell Institute.
Spell Institute	2	Warding	All Classes	350	Heroes of any class may learn Warding at the Spell Institute.
Spell Institute	3	Spark	All Classes	400	Heroes of any class may learn Spark at the Spell Institute.
Frost Tower	1	Frost Lattice	All Classes	400	Frost towers: slow lasts 10s instead of 8s; boss control resistance still applies, no additional damage.
Beacon	1	Beacon Lenses	All Classes	250	Beacons: +6 sight tiles; no attack or stacking.
Cleansing Altar	1	Cleansing Reach	All Classes	350	Cleansing altars: radius 9 instead of 7; no healing, shields or control-resistance reset.
Alchemy Guild	1	Sealed Vials	Alchemist	300	Alchemist: +3 defence; reagent cost and stock unchanged.
Alchemy Guild	2	Caustic Reagents	Alchemist	450	Alchemist: poison bottles +1 damage per dose; still five doses and one paid vial, six-vial limit.

• Field Medic: Not sold to a kingdom on the Undead path

Researched at	Price of each level
Market	300 → 400 → 600
Barracks	150 → 240 → 360
Mage Tower	200 → 320 → 480
Ranger Lodge	150 → 240 → 360
Guard Post	120 → 190 → 290
Builder’s Guild	100 → 160
Thieves’ Guild	140 → 220 → 340
Library	250 → 400 → 600
Temple	220 → 300 → 450
Spell Institute	320 → 480 → 720
Alchemy Guild	230 → 320 → 480

---

Research Tips

Priority Order

1. Potion Mastery (200g) – Low cost, high value; greatly improves Warrior survivability
2. Arcane Affinity (200g) – Noticeable boost to Mage attack power
3. Treasure Sense (350g) – Benefits all classes, increases gold income
4. Choose subsequent skills based on your primary class composition

All-Class Skills

Skills marked as “All Classes” apply to every adventurer and typically offer the best value for their cost.