Nev Inia's stone maul

Martial melee weapon, deals 2d6 bludgeoning weapon. Heavy, Two-Handed.
This weapon has 3 charges, you can expend one
of its charges to cast earth spike (DC 14) .
If you are standing on sand, you can expand one
charge to add +5 to your AC against one
attack, as sand comes and protects you from
harm. Additionally, if there is sand around you,
you can use a bonus action to summon or dismiss
the weapon.