Rotscale Dragon

The design notes and thought process which led to this beast are here.

The Rotscale Dragon is a massive creature of vile decay. Bone shows through in many spots, and it seems impossible that its tattered wings could possibly hole it aloft. Despite maggot-filled and hollow eyesockets, it keenly sense prey, and mindlessly attacks whatever it is commanded to by its master. (Masterless Rotscales obey a vague, distant, memory of an instinct, and seek out a "lair" which they fill with "treasure", all foul and disgusting beyond compare — rotting corpses, sewage-encrusted statues, and similar "valuables". At least one Rotscale found itself inexplicably worshipped by some very dim kobolds who thought they’d found a dracolich.)

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The Rotscale Dragon is surrounded by an aura of utter stench, which sickens any who enter it. In addition, the foulness that is its breath can make even the greatest warriors turn away from theit target. These two effects combine to make closing with it problematic, as does the Rotscale’s plethora of melee attacks. A Rotscale will often breathe and then spend an action point to use Old School Dragon in order to injure as many foes as possible in the opening round of combat.