Skills
A skill costs mana and nothing else. Cast as many as your mana allows, then ATTACK or GUARD to end the turn.
Every hero starts with one skill and can learn up to 3 more from tomes. You begin each battle with full mana and gain 1 at the start of each turn; GUARD gives 1 more. Skills have no cooldown and do not end your turn. Damage from a skill is 30% lower while you are weakened.
Strike every enemy once.
Each hit is an ordinary strike: it can crit, counts toward every-third-strike effects, and applies whatever your strikes apply.
Wren starts with it. Taught by the 
Tome of the Blade.
Deal 200% 
arcana + 
power and apply 2 
weak.
Twice your arcana plus your power, all of it arcane, so armor does not soak it. Then the target is weakened for 2 turns: it deals 30% less.
Ossa starts with it. Taught by the 
Tome of Spite.
Deal damage equal to 70% of your current 
armor.
70% of the armor you have at that moment. Enemy armor does not soak it, so cast it while your armor is full: at a fight's start, or the turn after a GUARD.
Brannoch starts with it. Taught by the 
Tome of the Wall.
Deal damage equal to 12% of your 
gold. Your gold is not spent.
12% of the gold you carry, ignoring armor. Nothing is spent, so the richer the run, the harder it hits.
Pip starts with it. Taught by the 
Tome of Coin.
Deal 120% of power + arcana as fire and apply 3 
burn.
120% of your power plus arcana as fire, ignoring armor, then 3 burn.
Ilse starts with it. Taught by the 
Tome of Cinders.
Deal 60% arcana + power to all and apply 2 
chill.
60% of your power plus arcana to every enemy, ignoring armor, and 2 chill each. A second cast, or one more chill, freezes them.
No hero starts with it. Taught by the 
Tome of Rime.
Deal 110% of power + arcana to every enemy.
110% of your power plus arcana to every enemy, ignoring armor.
No hero starts with it. Taught by the 
Tome of Tempests.
Apply 2 weak and 2 
vulnerable to the target.
No damage. The target deals 30% less and takes 30% more for 2 turns.
No hero starts with it. Taught by the 
Tome of Hexes.
Restore 30% 
health and 30% armor.
30% of your maximum health and 30% of your maximum armor, at once.
No hero starts with it. Taught by the 
Tome of Dawn.
Deal 250% of power + arcana, ignoring armor, and restore that much health.
250% of your power plus arcana, ignoring armor, and you heal for the damage it deals.
Anselm starts with it. No tome teaches it.
Skills and sets
Five Starwrought pieces make every skill cost 1 less (never free) and cast twice. Frostlight and Starhex chill or curse every enemy with each cast, Ossa's Hexfont adds 25% to skill damage, and Ilse's Quench makes skills chill what they hit.
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Written from the game's own rules, version 2.9.4. Spotted something wrong? Tell us on Discord.