Reference article
Huge Red Dragon
Huge Red Dragon is one of the three cave bosses in the main Unity version.
Encountering the boss
Equip a backpack from Genius Lab to enable the checked source’s boss encounter parameter. The Cave scene includes this opponent in its three-entry roster.
Combat
Its referenced prefab assigns 150 HP. Exact projectile damage, fight behaviour and rewards require further runtime/source checks, so those values are not inferred.
Edition scope
The creator confirms this public name. Flash lacks the backpack system; the checked boss encounter route is documented for the main Unity version only.