Divine Wrath

The wrath of the gods fuels your veins and ignites righteous power within your very soul through your rage. When cast, you are engulfed in celestial power that covers you in a 40ft sphere and gain advantage on all melee weapon and spell attacks, all your auras are extended by ten feet, and you gain an extra melee attack. Undead and Fiends within range of the caster's wrath have disadvantage on attack rolls and must make a DC 20 wisdom saving throw or be frightened for the duration of the spell. 

The spell lasts one minute, after which the caster is returned to their normal state. Alternatively, the spell can be ended early as a bonus action attack that channels all your divine power into a stream of pure light that deals 5d12 radiant damage in a 150 foot long, 10 foot wide beam with a DC 20

Depending on the caster's Paladin oath, they will gain the following passive effects:

Oath of Conquest - The Earth shakes beneath your feet in the wake of your holy might. Gain +5 to AC for you and your companions. Your divine aura is a fiery orange

Oath of Devotion - Godly power crackles around you in the form of electricity. Healing spells have an extra +5 to the HP they restore, also meaning extra points to lay on hands. Your divine aura is a stunning gold

Oath of Glory - You and all companions within range of your glorious light gain advantage on athletics and strength checks for the duration of the spell. Your divine aura is a valiant light blue

Oath of Redemption - Warmth blooms in your heart that touches your allies. You and all companions within your aura have a +5 to your spell modifiers/attacks for the duration of the spell. Your divine aura is a warm white light

Oath of the Ancients - Plant life blossoms around you where you touch the ground, even in desolate areas. All spells (including smites) by the caster and their companions that deal radiant damage now deal an extra +5 to damage rolls. Your divine aura is a brilliant green

Oath of the Crown - A glowing divine sigil of the god you follow is branded on the left side of your face. Wisdom saving throws can be rolled at advantage for you and allies within range. Your divine aura is a noble royal blue

Oath of the Watchers - An all seeing eye spawns over your shoulder that sees everything around you. You and your allies are immune to being surprised for the duration of the spell and can't be caught by sneak attacks or critical hits if they are vulnerable to them. Your divine aura is a shining silver

Oath of Vengeance - An angelic halo crowns your head as a sign of your oath. You and all party companions have your movement doubled while enemies within your aura have theirs halved. Your divine aura is a deep  purple

Oathbreaker - Your aura of light turns to shadow and enemies within range to feel the dark coldness of your hatred, causing ice to form where you step and the temperature around you to drop to below freezing. Enemies are blinded by your fury when within your aura while you and all allies gain +5 to melee damage rolls. Your divine aura is black as pitch.