Not stats, just the concepts. I will use the following format (and ask others to do so as well):
Name (title of book, system, publisher)- what concepts make it useful.
Seeder (Minions, d20, Bastion Press)- the seeder alters humanoid males so that all their offspring from that point forward are seeders. A very long term plot device (at least 9 months
), the seeder can be used to wipe out particular bloodlines or even whole nations.
Secret Eater (Minions, d20, Bastion Press)- mask wearing humanoids, the secret eater consumes 3 types of memories- what they look like under the mask, any encounter with them, and knowledge they want kept to themselves. A useful creature for all 3 main lines of Alternity, it can be used to keep certain knowledge out of the hands of the heros. It also requires players who are willing to play along.
Seedkin (Penumbra Fantasy Bestiary, d20, Altas)- these small plants are dangerous in combat only to the weak. Their major advantage is their reproductive potential. Each can infect an animal (inc humans) with 5-15 spores of combat seedkin and 1 spore bearer. Each spore bearer can reproduce, on average, 5 days after it germinate. I did the math and came up with 5-15 million combat seedkin and 2/3 million spore bearers in 150 days.
Scuttling Ooze (PFB, d20, Atlas)- this ooze normally feeds on giant clams. When there is an over population of the oozes or a crash of the clams due to harvest or disease, the oozes learn to hunt the people aboard ships. They can dissolve wood and act as a plug for the hole they create, as long as they live...
Child of Darkness/Child of Light (PFB, d20, Atlas)- these two templates are different parts of the life cycle of one organism. The child of light looks like a flying ray that glows (think the movie The Abyss). It flys over animals and releases spores. Those affected are the children of darkness. They are affected by mental problems and are drawn to collect where they were infected. If enough COD collect, they merge into a COL. The most powerful mind among the COD controls the new COL, but is driven to reproduce when the chance arrives.
Ocrilic (Monsters of the Boundless Blue, d20, Goodman Games)- these large birds use a chemical attack to freeze their aquatic prey. They normally eat small fish in tidal pools, but could freeze a hero that startles it. The GM might want to consider any hero so frozen to be in stasis and can only be warmed safely witht he proper medical gear.
Kaiptari (Monsters of the BB, d20, Goodman Games)- these fish have razor sharp filaments coming off their fins. The filaments are used as defense and offence and could damage a hero's breathing gear while deep under water.
Hatchoth (Monsters of the Endless Dark, d20, Goodman Games)- these giant insectoids are doubly unpleasant. They consume brain tissues and fluids and have an attack similar to a bombardier beetle (but more like a flame thrower).
Non-Euclidean (Book of Template (Deluxe Edition), d20, Silverthorne Games)- this template alters the creature as to be 4 dimensional. Those that view it can go insane (and the smarter the person, the greater the chance). Those attacking a NE, have a chance of missing as that part of the creature might not be there.
Wretched (BOT (DE), d20, Silverthorne Games)- this template is the result of too much genetic tampering. The creature becomes a half-ooze.
Plantform (BOT (DE), d20, Silverthorne Games)- this template is added to any non-plant to make it a plant. I like the concept.
Fast Fungi (Moderator's Guide, Blue Planet v2, Fantasy Flight Games)- this fungal like organism consumes all forms of bioplastic. No matter what the plastic is treated with, the fungi will consume it. But the treatments do prolong the life of the plastic and that is where the fun (for the GM) comes in. An example of use: the heros are carrying an important container of sterile medical gear that happens to be plastic. They learn it is infected and have to rush it to where ever they are taking it before the fungi breaks the seal. Some varities also consume human flesh.
Zipper (Natural Selection, BP v2, FFG)- this wasp like creature produces a toxin that is addictive in small doses and lethal in large doses.
Dune Creeper (NS, BP v2, FFG)- this vine lives off of seawater and concentrates the salt into sacrificial leaves. Okay, so this is a bio-geek thing, but I like it because it brings life to a normally green-less area (sandy seashores). I just wish it was real.
Cup Sucker (NS, BP v2, FFG)- this snail eats fast fungi. If used in a S*D campaign, finding the homeworld of fast fungi, and its predator could mean saving billions of lives.
Bad Mojo (NS, BP v2, FFG)- this fish eats other predators. It uses the sun to blind the prey and kills with sharp, bony fins.
String Worm (NS, BP v2, FFG)- this fish is extremely adapted to its habitat. It hides in tidal mud reefs and kills prey using poisonous palps that extend from its lips. It has not fins and does look like a worm.
Etyloseed (Wilderness Bestiary, Mechanical Dream, Steamlogic)- this internal parasite is extremely dangerous to human sized beings. Not because it inhabits them, but because they are 60 feet long and hates those that kill their hosts. It looks like a reptile with large, bony plates covering its limbs and back.
Pos (WB, MD, Steamlogic)- these 3 legged plants are dangerous to those that walk through shallow water. They jump at a potential prey creature and attempt to drag it underwater to drown.