Boon of Giant's Blood

You cause a willing creature you touch to grow larger for the duration, and everything it is wearing and carrying changes size with it. Any item dropped by an affected creature returns to normal size after 10 seconds. The target's size doubles in all dimensions, and its weight is multiplied by eight. This growth increases its size by one category-- from Medium to Large, for example. If there isn't enough room for the target to double its size, the creature or object attains the maximum possible size in the space available. Until the spell ends, the target also has advantage on Strength checks and Strength saving throws. The target's weapons also grow to match its new size. While these weapons are enlarged, the target's attacks with them deal double the dice of damage; for example, an enlarged longsword would deal 2d8 slashing damage (instead of 1d8), or 2d10 slashing damage (instead of 1d10) when used with two hands.

At Higher Levels. If you cast this spell using a spell slot of 4th level or higher, the duration is up to 10 minutes. If you use a spell slot of 5th level or higher, the duration is 8 hours, and the target is increased by 2 size categories (From Medium to Huge), but cannot reach Gargantuan. While Huge, their reach increases by 5 feet and deal an additional dice of damage with weapons. If you use a spell slot of 7th level or higher, the duration is 24 hours, and the target's hit points are doubled (when the target reverts to normal size, these extra hit points are lost). If you use a 9th level spell slot, the target's Strength becomes 25 while Huge.