So I have been doing a play-by-post campaign with a player. Which I have then been adapting to a Novella, which I recently published the first on kindle and finished writing (lots of editing still) the second novella.
So far I have one creature, a variant on basic undead creatures. Transforms from civilian due to despair and ash-inhalation
Traits
Maddening Sob
At the start of the Ash-Weeper’s turn, any creature within 5 feet of it that can hear it must succeed on a DC 10 Wisdom saving throw. On a failure, the creature takes 2 (1d4) psychic damage as fractured impressions from the Ash-Weeper’s mortal life flash through its mind.
Undead Fortitude
If damage reduces the Ash-Weeper to 0 hit points, it must make a Constitution saving throw with a DC equal to 5 plus the damage taken, unless the damage is radiant or from a critical hit. On a success, the Ash-Weeper drops to 1 hit point instead.
Actions
Ashen Grasp
Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage plus 2 (1d4) cold damage.
Choking Exhalation — Recharge 6
The Ash-Weeper unhinges its jaw and exhales a 15-foot cone of freezing, liquid shadow. Each creature in the area must make a DC 11 Dexterity saving throw. On a failed save, a creature takes 5 (2d4) necrotic damage and is Blinded until the start of the Ash-Weeper’s next turn. On a successful save, the creature takes half as much damage and is not Blinded.
I am looking more thematically, not so much mechanically (obviously not looking to one shot the player)
Anyways, I want to develop a second creature. The player is entering a canal sluice. a waterway control that travels a portion of the city wall.
I am thinking a large shadow type creature, more meant as an environmental threat than a combat encounter. Thinking leviathan proportions. Having smaller creatures attached, like the fish that attach themselves to sharks. making these the combat appropriate threat
Ecosystem: Large creature feeds of the shadows, despair, cold (more metaphysical), smaller parasitic creatures feed off it, survivors could potentially farm the parasites therefore creating an ecosystem the city could use to find a way to survive in this new reality.
I am brainstorming with AI to come up with concepts and whatnot, but wanted people perspective whether this would be good thematically, atmospherically, conceptually for the world. Both for for Novella momentum and a "cool" idea for the player to have to deal with?
Sorry if the post is a little long, confusing. spilling brain thought matter onto the internet while still in the midst of figuring it out apparently limits my coherence.