The Dusanu's original introduction was in module X5.BOZ said:bump for good measure
BOZ said:bump - come on, any OD&D fans out there?![]()
The Sigil said:The Dusanu's original introduction was in module X5.
Its second appearance was in AC9, the Creature Catalogue.
Its third appearance was in DMR2, (also) the Creature Catalog.
It may have appeared in the Mystara Monstrous Compendium (TSR 2501) - I'm not sure (though I am researching to find it out).
To the best of my knowledge, those were all of its appearances, in chronological order.