Talk to the priestess Basth in the temple, she will give you the ability.
i kinda figured it out: use the save file provided by DeepBride at the download section. with this file you can start from day 2 i think it was and you have to collect all the items and redo all the quest you already made, because the file is just with the main quests and quest item.
i hope it helps others like it did for me