Domain

Domains are a family of conjured effects behind a set of abilities specific to Commanders.
=Obtaining=
Here are the conditions for unlocking Domain skills of units:
* Domain skills are available to UR units alone
* The UR unit needs to be at 6* to unlock the Domain skill
* The UR unit must be placed into your formation
=Breakdown=
Before going over the explicit list of Domain skills, let's take a look at the skills and what they have in common.
==Trinity Self-Buff==
All 6* "Domain" skills always have a bonus effect (distinct from the Domain itself) that grants a distinct stats boost (usually 2) to the Commander unit as long as at least 2 more other units sharing its faction are on the battlefield.
This bonus remains in effect until either the Commander unit itself dies, or there are not enough units on the battlefield to fulfill the condition. 
==Hate Buff==
Next, all domain skills share a faction buff that reads "At the beginning of battle, if there is an enemy <hated faction> commander on the battlefield, friendly <allied faction> units gain 4=30% Unit Damage and Unit Damage Reduction.", where the <allied faction> refers to the faction of the commander itself while the <hated factions> are described below (see Faction Relations below).
Note that this buff does not stack (relevant for PvE purposes).
==Domain==
Finally comes the actual "Domain" part of the skill. This is a family of extremely powerful effects specific to each unit but with some common characteristics.
* They all conjure a specific "Domain" shortly after the battle starts. The trigger either involves for instance the unit activating another skill or simply after a number of seconds in combat has passed.
* All "Domains" feature a duration of 15s, and have a cooldown of 30s. Initial cooldown is possible, though it's not always the case.
* Most "Domains" will trigger a specific effect each time they are conjured (when they appear).
* All Domains feature a long list of continuous effects that are in place as long as they are on the battlefield. Please read below for "allied" and "hate" factions. Effects you will mostly encounter on the Domains:
** Buff effect(s) on friendly units of "allied" faction.
** Buff effects(s) on friendly units of non-"hate" factions (potential extra bonus on "allied" faction units)
** Debuff effect(s) on enemy units of non-"allied" factions (potential extra penalty on "hate" faction units)
** Debuff effect(s) on enemy units of "hate" faction.
Note: The Domain part of the ability does not require 3 units of the same faction to activate! Even if for example you have a Dragon Golem in your formation with no other Tower units, it will still periodically activate its Domain.
==Activating Domain==
For balance reasons, the game only allows up to 3 UR units from your formation to activate the domain part of their skills.
This can be configured from the Formation - Domain tab (under Artifacts and Rosters).
* All domains are turned off by default - so in case you notice your UR unit does not activate this part of the skill in spite of having the skill unlocked and upgraded, this is the reason.
* Available domains appear in the list based on the UR units with this skill unlocked in your formation (unknown at this point if backup UR units can activate domains)
* Check the domain skills you wish to allow to activate, up to three (most often there is no point in not activating domains if you have them available as they grant immense bonuses to your formation)
Note: Do remember that the first important condition to have access to a domain skill is to rank up your UR unit to 6*.
==Triggering Domain==
During combat, the general idea behind domains is to have periods of activation and inactivation, supported by their duration (15s) and cooldown (30s).
However, in order to trigger the domain ability, there are two categories:
===Autocast===
These are like regular abilities that activate on their own, with an initial cooldown, and then automatically trigger every 30s afterwards. Ice Demon, Troll, Venom Spawn and Mantis feature such a domain.
Since all these "Domains" last 15s under normal conditions and are re-conjured 30s since their last conjuring - effectively leading to a cycle of equal periods (of 15s) of "Domain" presence and absence.
===Trigger-Conditioned===
The domain ability casts as a response of a specific trigger. This trigger must occur while the domain is out of cooldown in order to be cast. Judicator, Dragon Golem, Evil Sorceress, Dark Champion, Regnan Seer and White Tiger feature such a domain.
Since this is more complex to explain, let's take an example with Judicator's domain and follow a possible battle timeline.
* Its trigger is Judicator being bestowed with High Morale 
* 3:00 - It has no initial cooldown, so we could put Monk in the same line with Judicator and trigger conjuring the "Domain" at the beginning of battle 
** This also activates the regular 30s cooldown, which means the domain cannot be retriggered earlier than 2:30
* 2:45 - The domain dissipates after 15s
* 2:43 - The High Morale naturally expires.
* 2:35 - The player casts King's Wind putting Judicator back on High Morale. Domain cooldown is still on for 5 more seconds so nothing happens.
* 2:30 - Domain exits cooldown. Note however that although Judicator is under High Morale, the trigger is "bestowing Judicator with High Morale". So Domain does not automatically reactivate.
* 2:25 - Player casts Mirth on Judicator. Since the domain is off cooldown, its conjuring is triggered. Once again, it will last for 15s (until 2:10) and be on cooldown for 30s (until 1:55).
==Faction Relations==
To simplify things we introduced the concept of "allied" and "hate" factions, but what are these?
* "Allied" faction refers to the faction of the UR unit possessing the domain skill. For Judicator, that would be Castle.
* "Hate" or enemy faction refers to the faction in direct opposition to the "Allied" faction. The hate relationship is symmetrical, and can be consulted in the table below. (for example, for Judicator the hate faction is Inferno, while for Venom Spawn it's Castle).
Faction 1	Faction 2
Castle 	Inferno
Rampart 	Necropolis
Tower 	Dungeon
Conflux 	Fortress
Cove 	Stronghold
=Domain Skills=
Here is an exhaustive list of currently available Domain skills in the game. Currently they are all 6* skills of UR units.