The Mark of the Beasts is a spiritual journey, as the brave accepts a spirit animal as guide, protector, and inspiration. In battle, your beast spirit fills you with supernatural might, adding magical fuel to your brave rage.

Most brave tribes consider a totem animal to be kin to a particular tribe. In such cases, it is unusual for an individual to have more than one totem animal spirit, though exceptions exist.

Source: Player's Handbook

At 3rd level, when you adopt this path, you choose a beast spirit and gain its feature. You aquire tattoos that carry the form of your chosen spirit animal.
At your option, you also gain minor physical attributes that are reminiscent of your totem spirit. For example, if you have a bear totem spirit, you might be unusually hairy and thick-skinned, or if your totem is the eagle, your eyes turn bright yellow.

Your totem animal might be an animal related to those listed here but more appropriate to your homeland. For example, you could choose a hawk or vulture in place of an eagle.

• Bear. While raging, you have resistance to all damage except psychic damage. The spirit of the bear makes you tough enough to stand up to any punishment.
• Eagle. While you're raging and aren't wearing heavy armor, other creatures have disadvantage on opportunity attack rolls against you, and you can use the Dash action as a bonus action on your turn. The spirit of the eagle makes you into a predator who can weave through the fray with ease.
• Elk. While you're raging and aren't wearing heavy armor, your walking speed increases by 15 feet. The spirit of the elk makes you extraordinarily swift.
• Tiger. While raging, you can add 10 feet to your long jump distance and 3 feet to your high jump distance. The spirit of the tiger empowers your leaps.
• Wolf. While you're raging, your friends have advantage on melee attack rolls against any creature within 5 feet of you that is hostile to you. The spirit of the wolf makes you a leader of hunters.

At 6th level, you gain a magical benefit based on the totem animal of your choice. You can choose the same animal you selected at 3rd level or a different one.

• Bear. You gain the might of a bear. Your carrying capacity (including maximum load and maximum lift) is doubled, and you have advantage on Strength checks made to push, pull, lift, or break objects.
• Eagle. You gain the eyesight of an eagle. You can see up to 1 mile away with no difficulty, able to discern even fine details as though looking at something no more than 100 feet away from you. Additionally, dim light doesn't impose disadvantage on your Wisdom (Perception) checks.
• Elk. Whether mounted or on foot, your travel pace is doubled, as is the travel pace of up to ten companions while they're within 60 feet of you and you're not incapacitated. The elk spirit helps you roam far and fast.
• Tiger. You gain proficiency in two skills from the following list: Athletics, Acrobatics, Stealth, and Survival. The cat spirit hones your survival instincts.
• Wolf. You gain the hunting sensibilities of a wolf. You can track other creatures while traveling at a fast pace, and you can move stealthily while traveling at a normal pace.

By 10th level, your instincts are so honed that you have advantage on initiative rolls.

Additionally, if you are surprised at the beginning of combat and aren't incapacitated, you can act normally on your first turn, but only if you enter your rage before doing anything else on that turn.

At 14th level, you gain a magical benefit based on a totem animal of your choice. You can choose the same animal you selected previously or a different one.

• Bear. While you're raging, any creature within 5 feet of you that's hostile to you has disadvantage on attack rolls against targets other than you or another character with this feature. An enemy is immune to this effect if it can't see or hear you or if it can't be frightened.
• Eagle.While raging, you have a flying speed equal to your current walking speed. This benefit works only in short bursts; you fall if you end your turn in the air and nothing else is holding you aloft.
• Elk. While raging, you can use a bonus action during your move to pass through the space of a Large or smaller creature. That creature must succeed on a Strength saving throw (DC 8 + your Strength bonus + your proficiency bonus) or be knocked prone and take bludgeoning damage equal to 1d12 + your Strength modifier.
• Tiger. While you're raging, if you move at least 20 feet in a straight line toward a Large or smaller target right before making a melee weapon attack against it, you can use a bonus action to make an additional melee weapon attack against it.
• Wolf. While you're raging, you can use a bonus action on your turn to knock a Large or smaller creature prone when you hit it with melee weapon attack.