This add-on turns wesnoth into a terrifying and brutal adventure. One of your heroes die and you try to reload... nevermind, you can't bring back the dead, you have to replay from the beginning of the scenario!
If you ever wanted to get rid of the temptation to reload, this is the tool for you. If a unit of yours dies, it will stay dead even if you reload, unless you start from the beginning of the scenario. This is a more forgiving version of the Unforfiving Hardcore Mod, with the difference that you can get your units back by restarting the scenario.
Singleplayer only. If you get sick of this, just uninstall it and restart the scenario.