favourite ability/ item from a manga/anime

mine personally are both from the anime/ manga, katekyo hitman reborn

my favourite item is a toss-up between the vongola buckle of the storm version X or the Vongola ring of the Sky version X (for those who watch the anime but don't read the manga, they will be on in a while)

my favourite ability though is the hyper die'ing will form which is just an amassing form especially with the X gloves.

i would like to know everyone else's favourite as well, so if you do reply thank-you and good night