Horror marks can be applied to both units and commanders by various effects, and will cause Horrors to have a random chance to attack the unit in an assassination setting at the beginning of every turn. In addition, horror marked targets are preferred targets for any horrors spawned in normal battles. A unit that is horror marked will have the icon displayed alongside its other abilities.
Horror marks stack: that is to say that a unit which is marked multiple times has a more severe mark and will be the target of more frequent and stronger horror attacks. There is currently no way to tell how badly horror marked any given unit is.
There is no way to remove a horror mark entirely. The only exception is units that may return once slain - for them Horror Marks are reduced every turn spent dead.
A unit can gain Horror marks in a number of ways:
There is no way to remove a horror mark entirely, though for units that may return once slain, horror marks are reduced every turn spent dead. This is always 10% of their mark count per turn, rounding down. The mark count will be reduced by a minimum of 1 mark per turn with the only exception that it cannot reduce a unit's marks to 0.
When hosting a turn, there are three different destinctions used by the game when deciding to send a horror assassination to a marked commander. First, the game considers "normal" horror assassinations. After this, there are then additional separate chances to send pretenders and to creatures in the Hall of Fame.to marked
The attack rate of horrors is dependent on several factors, and is calculated by the game as follows2):
Final attractiveness = (Attractiveness - Drain + Misfortune) * Global Horror Level
The resulting lesser horror attack is subject to the usual upgrading process and multiplicity described in the Horror article.
Due to the multiplication, the effect of scales on the attack rate is largely negligible unless the Global Horror Level increases dramatically.
In a normal game state with a Global Horror Level of 1, Horror Marks have an approximately 0.5% per mark per turn chance to produce a horror attack, which is then doubled if the commander has a cursed item, to a maximum of 50% at 100+ marks. This is consistent with experimental data 3)
Marked Pretenders and Disciples have a 50% chance to be considered for an attack by Mindless commanders are unaffected.. As with other attacks related to horror marks,
The probability of attack is calculated very similarly to the Eater of Gods, with two notable differences:
Combined,is therefore 2/5 as likely to attack an eligible commander as the Eater of Gods.