From Final Fantasy Wiki

Final Fantasy VII Enemy
Kyuvilduns
Statistics Level HP MP 24 800 0 Attack Magic Defense 48 40 42 M. Defense Dexterity Evade 64 56 1 EXP AP Gil 340 34 368
Elemental Affinities Fire Ice Lightning Water Weak - - - Earth Wind Gravity Poison Holy - - - - -
Japanese	キュビルデュヌス
Romaji	Kyubirudyunusu
Location	Mt. Nibel
Steal	Nothing
Item Dropped	Hi-Potion
Morph	Hi-Potion
Abilities	Lay Flat
Enemy Skill	N/A
Status Immunity	Nothing
Other Information	Abilities whose names are not shown when used are highlighted in italics.

Kyuvilduns is an enemy from Final Fantasy VII, found in Mt. Nibel. They appear as giant quadrupedal mosquitoes that use the attack Lay Flat, a powerful attack, but thankfully, their only attack. They appear in groups of three to five, and sometimes appear with Twin Brains. Use Fire3 or Beta to kill them quickly, or attack them.