Potion of Cloud Giant Strength ... On the other hand, it also grants the additional effects of Haste, a +2 to AC, and an advantage in Dexterity Saving Throws, making it one of the best items ...

The creature has a +2 bonus to Armour Class ... can also use Haste by equipping the Darkfire Shortbow or using a Potion of Haste. Hastened significantly increases the target’s Movement Speed ...