The Bad Son-in-Law
which is said to be able to slay 100 demons in one slash, Tessaiga seems to be inhabited by a spirit of its own who occasionally advises or guides Inuyasha on his journey to collect spirit orb shards.
The Tessaiga can absorb the power and superiority of any material, substance, or form of demonic energy making it even stronger. As a result, this also has an impact on its shape which also changes shape, such as Black Tessaiga, Dragon-Scaled, to Red Tessaiga. Later, it was revealed that Tessaiga and Tensaiga (Sesshomaru's sword) were originally one sword. The father also divided it into two to be passed on to each of his sons so that they understand the values of life and death.
4. Elucidato
Bab Populer