Colgera

is a TotK: in.

Characteristics
NaN Colgeras are massive worm-like creatures reminiscent of Series:, with a jagged layer of ice serving as armor for them. They have five eyes, large pincers, and a pair of wings on three of their body segments. One is responsible for the TotK: affecting the TotK: region. After this TotK:'s defeat in the TotK:, multiple NaN Colgeras can be found in arenas throughout the TotK:.

When defeated in the TotK:, NaN Colgeras drop NaN Colgera Jaws, and unlock a TotK: containing a TotK:.

Battle
Colgera flies through the air, firing icicle spikes at Link if he gets too close. It will also open portals that it will pass through to try and confuse Link about where it will be, sometimes appearing directly underneath him to perform a biting attack. The use of TotK: is necessary to dodge this attack, and will generally come in handy for repositioning throughout the battle.

Colgera's weaknesses are the purple glowing spots on its body, which are protected by a layer of ice on its underside and the spiky shell on its top. The ice can be broken with NaN Arrows (preferably ones that have been Fused with Fire Fruits, Fire Chuchu Jelly, or Bomb Flowers) or by skydiving onto it from above; despite Colgera's jagged exterior Link will not take damage from contact with it but he will be knocked back if his dive is not fast enough or if he hits the shell. Colgera takes a moment to regrow its spikes after shooting them and exposes its ice layer from above when it does so, making that moment ideal for Link to dive into it. Colgera harnesses wind to create powerful updrafts around it, which allow TotK: to glide up to it; using them will also fully restore his Stamina.

After half its health is depleted, Colgera will begin to summon tornadoes to attack Link and will behave more aggressively.

Trivia

 * Colgera is the one of two temple bosses whose HP doesn't scale based on story progression. It always has 600 HP total, and takes 100 HP for each weakspot hit.

Nomenclature
TotK:'s name appears to be a portmanteau of "cold" and "Series:".