Adellion is a MMORPG (massive multiplayer online role-playing game) set in a vast, three dimensional world being created by the HonourBound Ltd. staff. The staff is primarily volunteer based, thus likely accounting for its delayed release time. It has been in production since 1998. It has been featured in several magazines and has several fansites.

Adellion focuses on roleplaying more so than other MMORPG's. It prefers realistic simulation over fast-paced gameplay. The gameworld features, for example, permadeath, and neither magic nor supernatural animals, focusing rather on community building, tiny plots, politics and player interaction.

It is currently being published by Alchemic Dream.