While the Power Rangers have faced off against countless threats over the years and succeeded against all odds, that doesn't mean they haven't also dealt with devastating losses along the way. Few of these are more tragic than what the heroes have seen on the World of the Coinless, and the Ranger Slayer of that world is haunted by her worst regret - literally.
Source:https://www.cbr.com/power-rangers-unlimited-slayer-regret-boom-studios/