You see a sand vortex.
Notes
It looks like a Vortex, but brown.
Abilities
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Damage Taken From Elements
Physical 
Death
Holy
Ice
Fire
Energy
Earth
Drown
Location
The Sandking's room under the Dark Pyramid.
Behaviour
They fight in close combat.
Strategy
Do not attack them, they are immortal and will reflect all damage back to you. It is possible to lure some if not all of them to one side of the room then run to the opposite side to keep them away as you kill the Sand Broods