Circle of the Spirit Shaman

Shamans are druids of an ancient circle who ally themselves with spirits of nature they call forth for assistance. While shamans may appear to control these spirits, the spirits are intelligent, and serve their shamanic masters willingly. Some spirits even express a distinct personality.

Spirit Companion

Starting at 2nd level, your spirit is bonded to an animal spirit who joins you as a companion. As a ritual you can cast the find familiar spell using this feature or cast find familiar as a first level spell. A familiar summoned in this way draws power from your spirit, and can fight by your side. It gains a maximum number of hit points equal to 5 + half your druid level. As a bonus action, you can command your familiar to take the Attack action.

Shamanic Boon

Starting at 2nd level, while you are within 100 feet of your familiar you have summoned using your Spirit Companion feature, as an action you can perform a shamanic chant that empowers your spirit companion. Choose one of the following effects. The chosen effect lasts for 1 minute or until you end it as a bonus action. These benefits persist even if your familiar assumes a different form through your Empower Spirit feature. Once you use this feature, you cannot do so again until you finish a short or long rest.
Ancient Sage. A swirling green aura surrounds your familiar and it gains the ability to move through solid surfaces made of trees or plants, but it cannot willingly end its turn there. In addition, whenever an ally within 5 feet of your spirit companion makes a saving throw against a spell, you can use your reaction to grant that ally advantage on the saving throw.
Death Stalker. A red light glows deep within your familiar’s eyes as it gains a number of temporary hit points equal to your druid level. In addition, whenever your familiar or an ally within 5 feet of your spirit companion deals damage with an attack, you can use your reaction to add a bonus to the damage roll equal to your druid level.
World Speaker. A shimmering blue haze covers your familiar as any movement speed it has naturally is increased by 15 feet. In addition, whenever an ally within 5 feet of your spirit companion takes damage from a weapon attack, you can use your reaction to reduce that damage by a number equal to half your druid level.

Empower Spirit

Starting at 6th level, when you use your Wild Shape feature while you are within 100 feet of a familiar you have summoned using your Spirit Companion feature, you can empower your familiar rather than transforming, gaining the following benefits. The beast form is still a familiar and retains any applicable benefits.

• Your familiar undergoes a transformation into a beast with a maximum CR of 1/4. Starting at 9th level the maximum CR increases to 1/2, and at 14th level the maximum CR increases to 1. Unlike the druid, the familiar’s wild shape does not have a limitation on flying or swimming speed and it can transform into swarms. If your familiar is reduced to 0 hit points while in this form, its transformation ends and it returns to being a tiny familiar.
• The beast form loses its Multiattack action, if it has one.
• Your familiar uses your proficiency bonus rather than its own while transformed. In addition to the areas where it normally uses its proficiency bonus, a transformed familiar also adds its proficiency bonus to its AC and to its damage rolls.
• Your familiar can stay in a beast shape for a number of hours equal to half your druid level (rounded down). It then reverts to its normal form unless you expend another use of this feature, or until you use your Wild Shape again.

Spirit Link

Starting at 10th level, you can use your link with your spirit companion to sacrifice your energy and transfer it to your companion.
Whenever your familiar takes damage you can magically take that damage, instead of the familiar taking it. This feature doesn't transfer any other effects that accompany the damage, and this damage can't be reduced in any way.
In addition, if your familiar is dead, you can use your action and reduce your maximum hit points by 8 to instantly cast find familiar as though you had used your Spirit Companion feature to do so. This reduction lasts until you finish a long rest.

Bonded Wild Shape

Starting at 14th level, when you use your Wild Shape feature to empower your familiar, you can expend an additional use of Wild Shape to also transform yourself into the same beast as your familiar.

DM's Guild: Mordenkainen's Codex of Allies