Marimo balls
Revision as of 01:49, 7 January 2010 by Kerochan no Miko (talk | contribs) (as noted in the linked article)
Marimo balls were used as an attack by the Youma Akan in episode 32 of the anime. They were large seaweed balls that would expand to engulf a person, slightly suffocating him or her.
Actual marimo (毬藻) balls are a rare form of the A. linnaei algae, which grows at Akan Lake in Hokkaido.