Bastian, Mirri, Isobel and Ember ESO Companions

The first ESO Companions that were added can be accessed by owning the Blackwood chapter and they are called Bastian Hallix and Mirri Elendis. With the High Isle chapter two more companions were added, they are called Ember the Khajiit and Isobel Veloise.

You can find Bastian Hallix south of Deepscorn Hollow. Those seeking Mirri Elendis, will find her north of Doomvault Vulpinaz. Completing their initial quests will allow you to call on them for assistance by using their Collectible from the "Collectibles" menu. You may also call companions via hotkey.

The Companion Isobel Veloise can be found at Castle Navire on the southwest coast of High Isle. Ember can be found in at Draioch just north of Gonfalon Bay, the main city of High Isle 

Making friends or foes - Companions Rapport System

The friendship status among the player and a companion in ESO is called "Rapport". It measures how well you and your companion get along.

Each companion has their own set of ideals and preferences. They comment on different actions you take and things you encounter in the world based on these preferences. Figuring out what your companion likes and acting accordingly increases their rapport with you. Conversely, behaving in ways your companion dislikes or saying things they disagree with decreases their rapport.

The biggest recurring boost to a companion's rapport occurs when the companion is active and you complete specific daily quests that are meaningful to them. For example, completing the Fighters Guild daily with Mirri, or the Mages Guild daily with Bastian, will add a significant amount of rapport each day.

Rapport List

Companion behavior changes depending on their rapport with you. A negative rapport limits what a companion is capable of. They could even leave you for a time if rapport gets bad enough! Positive rapport, on the other hand, offers rewards and bonuses, such as additional quests (including quests that can unlock a companion as a houseguest).

Fine feathers make fine birds - Companions Customization

Each ESO Companions can be customized in multiple ways. They can wear any of your collected costumes, although you cannot hide their faces. Companions come with their own mount, but can also use any of the mounts that you've unlocked. When you summon your own mount, they summon theirs too and ride along with you.

To customize your companion, simply interact with them to open dialogue. Select the Companion Menu option and choose the Collectibles tab in the top right. You can change costumes and mounts on this tab. If you want to edit a companion's outfit, you must use an outfit station first before applying the outfit through the Companion Menu.

More info on ESO Companions customization here:

Each companion also provides a unique non-combat benefit while they are active. Truly bonding with your companion makes that benefit permanent.

The sword is the axis of the world

ESO Companions come equipped with their own basic gear. They have their own abilities and limited skill line progression, based on their background. You can configure and customize their active abilities through the Companion Menu. Companions can have multiple combat abilities pre-slotted into their active bar. They can also have a racial passive ability and a non-combat bonus.

A companion gains experience by fighting and killing mobs. The experience awarded to your companion is based on how much you receive when an enemy dies. (Your companion's experience does not reduce the amount of experience you receive.) Leveling up a companion makes them more powerful. It also unlocks additional ability slots and new abilities, including an Ultimate ability.

A Companion's maximum level is 20. A companion's progression and combat customization (including skill lines, active ability bar, and equipment) is preserved across all characters on the same account.

Companions Combat Customization in ESO

Customizing your ESO Companions for combat is very similar to player combat customization. Leveling up your companion unlocks class skills. Weapon and armor skill lines are based on experience gained while the appropriate items are equipped, as well as participating in repeatable quests for guilds. Companion skills do not morph or increase in rank individually, and do not require skill points to unlock.

To customize your companion, summon them and select the Companion Menu. Choose the second option, Skills. Slotting skills into the companion's action bar instructs them to use the given abilities. The order in which abilities are placed in the action bar determines the priority your companion gives them (if there is a valid target). Companion abilities use cooldowns rather than resource pools.

More on Companion skills here:

You can give your companion the role of tank, healer, or damage dealer by setting the appropriate abilities in the companion's action bar. You can also mix abilities to give your companion a hybrid role.

Companions Gear

Companion gear is its own category. ESO Companions have their own weapon and armor equivalents. Players cannot equip companion gear, and vice versa. Companion gear has item quality, stats and companion-specific traits, but it cannot be upgraded or enchanted. There are no item levels or item sets for companion gear.

You can find companion gear when you are participating in content while your companion is active.

More on Companion gear here:

Companions and Housing

If you grow close with your companion and assist them in their time of need, they may become comfortable visiting your home and unlock as a houseguest.

A houseguest collectible of the companion functions like other houseguests. They count as a special collectible. You can place your companion houseguest or assign them to paths in your house.

Availability of Companions

Your Companion's level and combat selections carry across all characters. Quest completion, rapport, costume, and mount overrides are determined separately for each player character.

ESO Companions are available to participate in the majority of overworld content. They can assist in questing, defeating group bosses, completing dungeons, exploring delves, and more. However, companions cannot participate in PvP. You cannot call your companion in Cyrodiil, Imperial City, or battlegrounds. You also cannot call your companion inside houses.

Players can only have one companion active at a time. Companions count towards player limits in grouped content, and are not available in arenas.

Controlling Companions

These are the default controls for PC.You can issue commands to your Companion with the keybind Y. If you wish to bind it to a different key, navigate to the "Keybindings" section of the "Controls" menu. Note that these commands work for Combat Pets as well.

When you issue a heavy attack (pressing and holding Left Mousebutton), a Companion will switch to your current target.Using Y and Left Mousebutton will command a Companion to attack a target.

Using Y and Right Mousebutton will command a Companion to stop attacking and come back to you.

You can configure your Companion's use of their Ultimate in the "Gameplay - Combat" section of the "Settings" menu.

Unlocking Companion Quests

The personal quests for the companions are unlocked when you reach 1500, 2750 and 4000 rapport with them. Completing their second quest will also unlock their special loot passive while you have them active.