Elemental Potency

 choose one ,gains prof bonus uses of a effect when using that damage type

acid reduces the targets ac by 1 for 1 round

cold creatures are under the effects of slow until the start  of the next round

fire creatures or unattended non-magical flammable objects to catch on fire deals prof bonus additional damage on hit and at the end of the next round 

lightning deals prof bonus additional damage to targets in water and has the effect of heat metal for one round if wearing armour 

thunder deals additional prof bonus damage to objects structures and constructs and deafens for one round

poison gives the poisoned condition and increases the save dc by 2

psychic does not require material ,somatic or verbal components

force knocks back the target by 10 feet if targeted in a downward direction knocks prone and upward takes 1d6 fall damage

radiant  deals prof bonus bonus damage to fiends and undead 

necrotic damage cannot be healed by spells or potions