Arcana are unique to the Grymkin faction, and are used by their warlocks in lieu of feats.
Nevertheless they can still be downloaded for free from PP's website - you just need to look for the "New core rules" download instead of the "Rules" download.]
Arcana Core Rules
Instead of feats, Grymkin warlocks have Arcana cards. Arcana cards can be played at any time during a game in accordance with the rules on the cards. Each of a warlock’s Arcana cards can be played only once per game. A warlock can play only one Arcana card per turn.
There are two types of Arcana cards: regular Arcana cards and Trump Arcana cards. Each Grymkin warlock has one Trump card that can be assigned only to that warlock. The remaining Arcana cards can be assigned to any Grymkin warlock.
Before either player’s deployment at the start of the game, a Grymkin player assigns each of his warlocks three Arcana cards and reveals those cards to the opponent. One of these three cards must be the warlock’s Trump card. The other two cards can be any non-Trump Arcana cards, but each card can only be assigned to a single warlock in the army once. In other words, no duplicate Arcana cards are allowed within an army.
|You can trigger it when an enemy model ...||What it does|
|... advances and ends its movement in the warlock's control.||For one round, enemy models beginning their activations in the warlock's control suffer –2 SPD that activation.|
|... non-warcaster, non-warlock model issues an order while in the warlock's control.||The model’s unit is not affected by that order. Can not affect a Warlock Unit/Warcaster Unit.|
|... targets a model in the warlock's control with a spell.||The spell does not take effect, but is still considered to be cast and its COST remains spent. Additionally, all enemy upkeep spells in the warlock’s CTRL range expire.|
|... destroys a friendly Grymkin model in the warlock's control.||After the destroyed model has been removed from the table, you can remove all damage points from each friendly Grymkin model in the warlock's control.|
|... destroys a Grymkin warrior model in the warlock’s control.||For one round, enemy models suffer –1 to attack and damage rolls.|
|... advances into and ends its movement in the melee range of a smaller-based friendly Grymkin model in the warlock's command.||Immediately add to play one Grymkin heavy warbeast to the warlock's battlegroup, placing it anywhere completely within 5˝ of the smaller-based friendly Grymkin model. The warbeast cannot advance. The warbeast is removed from play after one round.|
|... misses a friendly Grymkin model in the warlock’s control with an attack.||For one round, friendly Grymkin models gain +1 to attack and damage rolls against enemy models in the warlock's control.|
|... destroys a friendly Grymkin model in the warlock's command with a ranged attack.||... For one round, friendly Grymkin models gain stealth while in the warlock's control.|
|... damages a friendly Grymkin model with a corpse token that is in the warlock's control.||... For one round, while in the Warlock's control, enemy models lose incorporeal, tough, and undead, and can't have damage removed. Also, enemy non-warbeast models lose Construct while in CTRL.|
|... ends its Normal Movement in the warlock's control.||... Centre a 4" AoE on the enemy model. Choose whether it's an acid bath, burning earth, forest, hill, rubble, or shallow water. You may remove this at the start of any of your turns.|
Refer to individual warlocks for their Trump cards, and any associated rules clarifications.
Rules Clarification: Arcana (Edit)
The Heretic - Reckoning - None yet
The Dreamer - All Fall Down [Show/Hide]
The Child - Wrath [Show/Hide]
The Wanderer - Divergent Path - None yet
The King of Nothing - Taste of Ashes [Show/Hide]
Ill Omens [Show/Hide]
The Shadow [Show/Hide]
|Grymkin Index (Edit)|
|Units, Solos, & Battle Engines|
|Battle Engines||Death Knell|
|Dark Menagerie - Bump in the Night||Eilish Garrity, the Occultist|