Sieni are mushroomlike creatures developed by Metron. Sieni are white and about a foot tall, with two small black eyes. Sieni appear harmless but are poisonious to the touch and explode in a rain of sulfuric acid when killed. A Sieni loses its roots once fully grown, and they take only a few seconds to grow from seed to full grown, like Man-Eaters. Once fully grown, they can hop around on their stem. Sieni are commonly found in groups along with a Giant Sieni.
- Sieni means mushroom in Finnish.
- By request of the people of Stevonia, there is also a line of Seini being produced that don't have the poisonious qualities of the ones used in battle. These can be distincted by their brownish stem insted of white.
- Harmless Sieni are only 9.95 credits each, and come through the mail as a seed, so you can plant it.
- All types of Sieni require no food, only sunlight and water.