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Why can’t I use my Lesser Hiryu anymore/it’s failing to bond to me?
Lesser Hiryu code was changed. For a long time, anyone could command and bond a Lesser Hiryu without any Bushido or taming skill, they just couldn’t ride it. However, a recent changed now makes it a requirement that you either having taming or a minimum of 90 Bushido skill in order to command and bond a Lesser Hiryu.
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From the FAQ in the "Way of the Samurai: A Guide to Bushido in Ultima Online" Thread in the Samurai forum.
Samurai Guide