What is esf companions?

ESF Companions is a feature in the game "Elder Scrolls Online" where players can adopt and raise certain NPC characters, known as companions, to fight alongside them in battles. Companions come with their own unique personalities, backstories, and skill sets, making them useful in different combat situations. Players can level up their companions, customize their appearance and gear, and even generate new dialogue options through their interactions. However, companions cannot be used in PvP battles and have limited interaction with the game's main storyline. ESF Companions was introduced in the game's Blackwood expansion in 2021.