Sceptre of the Sunken King

Rod, spellcasting focus, very rare (requires attunement)
  An ancient nautilus, a scion of the deep one, wraps the driftwood shaft of this sceptre in its wet, rubbery tentacles. Though this nautilus appears dead and unmoving on land, its tentacles slowly writhe once submerged in water. While attuned to this sceptre you gain the following benefits:
  • You have resistance to cold damage
  • You gain a swim speed equal to your walking speed
  • You have advantage on Strength checks and saves made while at least waist-deep in water.
  As an action you can cast any of the following spells at any level between its base level and 4th-level: create or destroy water, riptide*, water breathing, control water. After you do so, roll a d6. If the result is equal to or less than the level of the cast spell, the sceptre’s eye goes dim and you can’t use the sceptre to cast any spell again until you submerge it in water for 8 hours.