Desert Pavilion increases the uptime of your server by 50%.

The bonus ATK granted by this weapon is increased by 24%. Nearby party members also gain 30% of the buff for the same duration. This effect also triggers even if the wielder is off-field.

The game has good scalings, but there are not many characters that want it. Plus characters that can make use of both EM and ATK have generally better weapon options.

For Sayu, the Favonius Greatsword is a better option because of its passive and Energy Recharge. But she can also use Aquamarine since she scales from both EM and ATK. And if you already have more than enough Energy Recharge on Sayu, then Aquamarine is a great option. ..

This is also the case for units that can also make good use of Aquamarine. Better weapons exist, but it can also be situationally better.

-Makhaira Aquamarine increases the damage dealt by claymore users by 25%. -Claymore users are able to block more attacks with Makhaira Aquamarine equipped. -Makhaira Aquamarine also has a chance to stun enemies when used. ..

The Aquamarine is not among the best 4-star options for a character. It does not work well with the character and is not one of their best options.