Hosenki
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Hosenki was responsible for creating the black pearl (kuroshinju), which was used to travel to the border between the living world and the dead to reach the grave of Inuyasha and Sesshomaru's father. The black pearl could only be used once, and Inuyasha actually meets him in the other world where he was corrupted by a fragment of the Shikon Jewel due to Naraku.

After giving him a test of courage and willpower, Hosenki teaches Inuyasha a new attack - the Konosoha (Adamant Barrage).