Colossal strikes

Spell Lists: Ranger, Artificer, Paladin, Cleric
4th-level transmutation
Casting Time: 1 bonus action
Range: Self (15-foot cone)
Components: V
Duration: Concentration, up to 1 minute
You touch a weapon and transform it into an oversized version of itself. The weapon grows two size categories, as per enlarge reduce weapon shifting rules.(use titanic weapon rules if the size would constitute it), To wield this weapon effectively, a creature must have a Strength score equal to or higher than the weapons base min str requirement. Otherwise, it has disadvantage on attack rolls with the weapon, and gains none of the other benefits of this spell.
On a hit, an affected weapon deals an additional die of damage. If the target is two sizes smaller than the weapon use the maximum damage roll for this bonus die, instead of rolling it. If attack with an affected weapon is rolled with advantage and both attack rolls would hit, the target is also knocked prone.