While equipped, it summons a Rare Sand Elemental that summons healing orbs while the player is damaged. These healing orbs are cast once every two seconds, automatically home in on the player, and restore 25 health each, effectively granting an extra 12.5 health regeneration per second.
The elemental emits a large amount of light when casting an orb.
The elemental attempts to position itself 10-18 blocks to the left side of the player.
The healing orbs spawned by the elemental cannot pass through blocks, greatly reducing its effectiveness in enclosed areas.
The healing orbs will disappear after a certain amount of time, reducing their effectiveness to players constantly moving faster than the orbs.
The Rare Elemental in a Bottle is the only pure Expert Mode-exclusive item that is not dropped from a boss or crafted.
In the mod's source files, the Rare Elemental in a Bottle is referred to as "WifeinaBottlewithBoobs".
The Rare Sand Elemental projectile was previously called "Drew's Sandy Waifu" in the mod's source. Drew (also known as MountainDrew or Fabsol) is the lead developer of the Calamity Mod.
This item used to be called "Rare Waifu in a Bottle", while the Rare Sand Elemental herself used to be called "Rare Sand Waifu". After that, they were known as "Madame in a Bottle" and "Madame Sandy", respectively.
In previous versions of the mod, the Rare Sand Elemental used the same AI as the normal Sand Elemental minion, dealing contact damage and summoning tornadoes. The summon can no longer deal damage and exists solely to heal the player.