Path of the Titan Marked

Typically a barbarian harnesses their own rage to manifest abilities. Barbarians who follow the Path of the Titan Mark affect the very environment around them as their rage brings forth an aura of ancient and unrelenting power. Somehow, someway barbarians of this path where marked by a Titan, a Primordial entity that has in some way influenced them. This could from them roving across it's corpse for years, eating the flesh of a recently deceased Titan or merely being close enough to the prison of one.

Titanic Aura

When you select this path at 3rd level, you emanate a magical aura while you rage. The aura extends 10 feet from you in every direction, but not through total cover. When you adopt this path, you choose a Titan that has marked you, this choice will be the type of aura you will have for the  levels taken in this class. This can be anything from a strange pattern with unnatural coloring on your body to an archaic symbol appearing on your skin.

Death. When this effect is activated, all other creatures in your aura take 2 necrotic damage each, as your presence seems to suck in the life-force of all things nearby. The damage increases when you reach certain levels in this class, increasing to 3 at 5th level, 4 at 10th level, 5 at 15th level, and 6 at 20th level.

Storm. When this effect is activated, all other creatures in your aura take 2 lightning damage each, as a small storm whips around you. The damage increases when you reach certain levels in this class, increasing to 3 at 5th level, 4 at 10th level, 5 at 15th level, and 6 at 20th level.

Frost. When this effect is activated, all other creatures in your aura take 2 cold damage each, as the temperature drops around. The damage increases when you reach certain levels in this class, increasing to 3 at 5th level, 4 at 10th level, 5 at 15th level, and 6 at 20th level.

Volcanic. When this effect is activated, all other creatures in your aura take 2 fire damage each, as the air heats around you. The damage increases when you reach certain levels in this class, increasing to 3 at 5th level, 4 at 10th level, 5 at 15th level, and 6 at 20th level.

Titanic Influence

At 6th level, the Titan grants you benefits even when your aura isn't active. The benefits are based on the Titan you chose for your Titanic Aura.

Death. You gain resistance to necrotic damage, and you don’t register as disturbing haunted ground only triggering the ire of spirits if you or they are actively hostile. Moreover, as an action, you can touch an  object that isn't being worn or carried by anyone else and cause it to decay or rust.

Storm. You gain resistance to lightning damage, and you can breathe underwater. You also gain a swimming speed of 30 feet.

Frost. You gain resistance to cold damage, and you don’t suffer the effects of extreme cold, as described in the Dungeon Master's Guide. Moreover, as an action, you can touch water and turn a 5-foot cube of it into ice, which melts after 1 minute. This action fails if a creature is in the cube.

Volcanic. You gain resistance to fire damage, and you don’t suffer the effects of extreme heat, as described in the Dungeon Master's Guide. Moreover, as an action, you can touch a flammable object that isn't being worn or carried by anyone else and set it on fire.

Titanic Size

At 10th level you can increase your size as though you had the spell Enlarge cast upon you.  Your size doubles in all dimensions, and your weight is multiplied by eight. This growth increases its size by one category – from Medium to Large, for example. If there isn’t enough room for the you to double its size, you attains the maximum possible size in the space available. Until the spell ends, you also has advantage on Strength checks and Strength saving throws. Your weapons also grow to match your new size. While these weapons are enlarged, the your attacks with them deal 1d4 extra damage. At Level 20 you can double your size category instead if you wish, doubling your walking speed and increasing the bonus damage to 2d6,

Presence of a Titan

At 14th level, the power of the storm you channel grows mightier, lashing out at your foes. The effect is based on the Titan you chose for your Titanic Aura.

Death. On the start of your turn can use your action to force all creatures to make a Constitution (10 + proficiency + CON modifier) saving throw. On a failed save, the creatures takes necrotic damage equal to your Barbarian level. You gain temporary hit-points equal to the damage dealt.

Storm. When you hit a creature in your aura with an attack, you can use your reaction to force that creature to make a Dexterity saving throw. On a failed save, the creature takes lightning damage equal to your Barbarian level. Your aura now has the affects of Warding Wind, which lasts as long as you are raging. You in addition gain a fly speed equal to your walking speed.

Frost. Whenever the effect of your Titanic Aura is activated, you can choose one creature you can see in the aura. That creature must succeed on a Constitution saving throw (10 + proficiency + CON modifier) , or its speed is reduced to 0 until the start of your next turn, as magical frost covers it. Each turn it is covered in this frost it takes damage equal to your Barbarian level.

Volcanic. Your aura has turned the area around you into hazardous terrain by turning it into magma. While raging and for a minute afterward you are immune to the damage from magma, and thus can move across or through it with your swim or walk speed depending on the depth. Moving leaves a trail of magma that cools and hardens after 1d6 turns of being outside your aura, or after 10 minutes.