Echoes Act 3

The stand of Koichi Hirose from Part 4 of JoJo's Bizarre Adventure, "Diamond is Unbreakable".
This specific act of Echoes only has one canon special ability, that being "Three Freeze".
It basically makes stuff heavier.
Echoes Act 1&2 was centered around "The Power Of Your Words" (for a more simple explanation, Echoes would release a word/sound, and it would play in the victim's mind, making them go "crazy".
Echoes Act 3 surprised a lot of jojo fans, mostly because it had an ability that was very different from the other acts.
*SPOILERS FOR DIAMOND IS UNBREAKABLE*
Three Freeze is used for the first time against Kira Yoshikage's "Sheer Heart Attack (SHA)". It made SHA very heavy, and because Kira had his hand connected to it, his hand also got heavy. Three Freeze was also helpful at the end of Part 4, because Echoes made Kira's hand heavy (again), allowing Jotaro to stop time and kill Kira.