Revised Smite

Starting at 2nd level, you gain a pool of d8s to use towards Smite. When you hit a creature with a melee weapon attack, you can expend one d8 to deal radiant damage to the target, in addition to the weapons damage. The maximum amount of dice that can be spent increases by 1 at level 5 (2d8), level 9 (3d8), level 13 (4d8), and again lastly at level 17 (5d8). The damage increases by 1d8 if the target is an undead or a fiend, to a maximum of 6d8.

Doing this does not interrupt multi attack like some abilities or spells (eg. green flame blade, booming blade). Each use of Divine Smite during a multi attack functions as stated above. 

You regain all expended uses during by spending an entire short rest mediating or praying to your god or some other higher service. Doing this sacrifices the benefits gained by a normal short rest and instead you only regain all lost charges of Divine Smite. Long rests allow you to regain all lost charges as normal. 

By 11th level, you are so suffused with righteous might that all your melee weapon strikes carry divine power with them. Whenever you hit a creature with a melee weapon, the creature takes extra radiant damage equal to your {{modifer:cha}. At 17 level the extra damage is equal to your {{modifier:cha}} + {{proficiency}}. 

If you are an Oathbreaker or similar type of Paladin (eg. death knight) your damage is a tainted form of it's original divine power. The damage type changes to reflect your cosmic stance, however, a trace of the divine power is still there. You can choose how much of the damage, if any is necrotic, however there will always be at least 1 damage dice that is radiant.