Companion

Companion in TERA is umbrella term for pets and partners since May 2019 patch that added new style partners.

Companions are listed in new Companions Menu. (Pets were previously learned as skills and listed in Skills Menu.) Hotkey to open Companions Menu is Control-P in TERA NA. EU publisher for some reason didn't add any hotkey, and you have to add that manually, or access the menu from Main Menu->Social->Companions. You can also open Companion Menu left clicking pet icon when it's summoned.

List has 10 slots and can be expanded with certain items from cash shop or events.