Companions are loyal personal allies to the Tenno. They will use their own unique precepts, weapons and abilities to assist their owners in their missions at any cost, even going so far as going directly into harms way to protect them. Companions are not a one-time-use ally gear like Specters, but rather equipped in their own slot in the user's loadout via the Arsenal. Users can only equip one companion at any time. A companion's stats, abilities, and behaviors can be upgraded and manipulated via their own set of mods. Modding companions is similar to modding Warframes.
There are currently seven classes of companions: robotic Sentinels, living Kubrows and Kavats, the modular MOAs, the infested Predasites and Vulpaphylas, and the advanced Hounds. There are many differences between these classes ranging from combat and movement behaviors to acquisition to possible maintenance requirements. Most classes also have their own distinct subclasses, each with dedicated mods and other specifications.
Sentinels are hovering companions that follow their Tenno masters around and assist in various ways, dependent on the precepts used to program them. It is possible to program sentinels with precepts, or skill mods, that can turn a sentinel into an attack drone or a support drone. Sentinels can also accommodate their own unique stat-increasing Mods, similar to Warframe mods.
Kubrows are terrain-restricted melee canine companions. Kubrows behave similarly to NPC allies (i.e. specters) as they will stay within close proximity of the player while fighting alongside them and will enter bleedout states when they are downed, from which they can be revived. Incubated Kubrows have variable permanent traits such as species, height, and eye color, as well as customizable features like fur color and fur pattern. There are currently 6 species of ownable Kubrows, each with different stats and abilities.
Vulpaphyla are terrain-restricted Infested fox-like companions. There are 3 subspecies of Vulpaphyla.
In general, precepts are mods which alter the behavior of a Companion, and are effectively the companion's "abilities". Every type of Companion has their own specific precepts that cannot be used by the other type (For example: The Djinn Sentinel cannot use the Helios Sentinel's Investigator precept). However, there are precepts that are universal within a class of companions. Upon acquiring a companion, the user is automatically granted its respective specific precept mods.
Companions will use their precepts in a prioritized order, where the top left slot is the highest priority and the bottom right slot is the lowest. Precept mods do not need to be installed in the respective polarized slot to be used.
Companions will check to see if the conditions to use the highest priority precept are fulfilled, and will continue to use that precept until the conditions are no longer met. Then they will check each other precept in priority order. Companions will also interrupt the usage of lower priority precepts to use higher priority precepts.
Active pet companions can roam and/or follow their owners around the Orbiter, excluding Sentinels, MOAs, and Hounds.
They can interact and play with Roller Floofs in the Orbiter.
Modified the Pet Incubation screen to allow you to purchase Companion Inventory Slots for Platinum if you need them, thus removing the extra step of having to leave and use the Market. (I.e. behaves like when you try to claim a weapon from the Foundry but have no free Slots).
Fixed Companions that are “released” to vendors still following you after you’ve done so.
Fixed getting an "Unknown Error" when you try to start a Companion Incubation while already Imprinting.
Fixed visual issues caused by maturing Companions in the Orbiter.
Fixed the Incubator dome animation playing after selecting new companions or maturing them. Swapping will be instantaneous and no animation will be played as intended.
Fixed choosing “none” as a companion in the Railjack Arsenal causing the camera to clip into the Arsenal itself. This also fixes the same thing happening when switching back and forth from the companion tab.
Fixed a case of Companions Moas spawning in the Arsenal floor and then falling when equipped.
Fixed cases where Companion inventory slots were not counted correctly if you didn’t own any Kavats or Kubrows, leading to the game giving you an error when you tried to look at your Inventory, Trade, or Craft a new Companion.