threre are some Kaguratits somewhere...
Sesshoumaru managed to break his evil sword. after that Tensaige was forged into a weapon. It was able to spam incomplete paths to hell.
Some weird dude appeared. he claimed this was originally his ablity. Sesshoumaru was not amused, mastered the skill and killed the bastard.
Thes blacksmith told them that Tensaiga was just a crap only created to contain this move because Inuyasha would not be able to hande hells dmonic power.
Sesshomaru threw the sowrd away during a fight with inuyasha. Inuyasha broke it and absorbed the ability.
Sesshoumaru got his healing tensaiga back and later got his arm regrown due some pride fagottery. he also gained a sword that way.