Armor Stiffener

Epic Plane upgrade

Rare Plane Upgrade. Like a stiff upper lip. But for a plane.
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Tax: 9 g / 100 i
Guild: 6 g / 100 i
Wiki page
NameLocationNormal %Difficult %Lethal %
White SpiderThe Island1 in 10
Doomsday MechanismSuper Secret Base1 in 101 in 31 in 1
High Priestess TiffanyTemple of Bast1 in 101 in 31 in 1
SN-ZIron Lair1 in 10
Dark SphinxThe Elder Arena1 in 101 in 31 in 1
Treasure3 Brothers1 in 4
Godleader MeowzaThe Great Leader's Command Center1 in 4
Godleader MeowzaThe Great Leader's Inner Sanctum1 in 1

Drop rates are either: datamined, based on a pattern, or even simply estimated from observation.

As of 2019/11 drop rates can no longer be datamined. Data is updated based on patch notes and developer commentary.