Weapon

Very Rare Required Requires Attunement

This massive blade is nearly twice as long as a normal great sword and eight as heavy. While inactive, this weapon is too large for small or smaller creatures to wield, and Medium creatures have disadvantage on attack rolls made with this weapon.

You have +1 to attack and damage rolls made with this weapon. While wielding this great sword in two hands, as a bonus action, you may speak a command word causing you to grow by one size category. Your size doubles in all dimensions, and your weight is multiplied by eight. If there isn't enough room for you double in size, you attain the maximum possible size in the space available. You also have advantage on Strength Checks and Strength Saving Throws. These effects last for 1 minute. Once this ability ends, you cannot use it again until the following dawn.

While active, the sword also grows whenever you do. The sword is always slightly to large to be wielded easily, and you have disadvantage on attack rolls with it. The sword is unaffected by anything that would otherwise change its size, and instead will adapt its size to that of its wielder when activated. It will not shrink further than its base size.

This weapons damage die scales with your current size category: