Elemental rage

Your main focus is using your weapons and making them do extra damage with the magic damage. As a bonus action, you can change the magic damage type and later on cast spell related to the damage type.

Power of the elements

As a bonus action, you can change element damage to your chosen weapon. Your chosen weapon has to be a weapon you have spent a short rest attuning to. At level 3 when you chose this path you do an extra 1d6 damage of the element you chose. At level 6 you do an extra 2d6, at 10th it does 3d6, at 14th it does an extra 4d6. To light up your weapon with a element type you can do it as a free action, but it is a random.

Element spell

As an action depending on the element damage the weapon is activated you can cast different spells. If it is acid type: Acid slash, Chaos Bolt, and Acid stream. If it is fire: Burning hands, Firebolt,  and produce flame. If it is ice:  ray of frost, frostbite, and ice knife.  Lighting:  Shocking Grasp, and witch bolt.

Empower the elements

As a bonus action while in a rage you can empower your weapon. While you are in rage or after a minute after activation or until you change damage type you can deal an extra 1d6 of that damage, if you crit while in this stage you do an extra 2d6 damage + the crit bonus. While in an ice state now you can cast armor of agathis and while in a different state you can cast mage armor.  When you reach Level 14 you can cast both of those at level 4. Also while empowered you gain resistance to the type of element you chose. You can use this once per day.

Encase the elements

When you change the damage type anyone in a 10 feet radius must make a DC(10+Stregth mod+proficiency) dex save or take 1d6 of the elemental damage type. As a bonus action, you can incase your self in the element power. For the next minute or if you change element type, you do extra 3d6 element damage on top of the rest of the damage. You gain +5 speed. You are immune to the damage type for the duration. When you activate this ability all creatures in a 30feet radius must make a DEX save( DC 10+Strength score+proficienct bonus) or take 1d6+Stregth score. During the duration, you can use a bonus action and take a point of exhaustion to add a d6 to all of your attacks.