Yu Yu Hakusho1992

Suzuka:
These two items are my gifts to you.

Kurama:
Could you elaborate?

Kazuma Kuwabara:
Yeah, who cares about a fancy ruler?

Suzuka:
It's a hilt, amateur. These were the starting points for two items I gave to my own team. The bottle, Kurama, contains The Fruit of a Previous Life, hand-picked from the upper realms of the spirit world. It was from just such a fruit that Ura derived the smoke for his Iduun Box, and drinking that will produce the same dreamy effect of turning you into your demon form.

[Turns to Kuwabara]

Suzuka:
And that one is called The Trial Sword, made from a Japanese cedar that grew to great heights by sucking up the surrounding life.

Kazuma Kuwabara:
Eih! That sounds really creepy. I don't wanna hold that.

[Kuwabara tosses the hilt to Suzuka]

Suzuka:
For Shishiwakamaru it became The Banshee Shriek, but for you it should be quite different, and probably without the demons.

[Suzuka tosses the hilt back to Kuwabara, which he catches awkwardly]

Kazuma Kuwabara:
Yi, uh, ehe, guh, geh...!

Suzuka:
Allow me the pleasure of a few more words and I'll give you a warning. This fight was the first time those items were used. I still can't tell you exactly how they work or what side-effects they could have upon their user.