From a reddit post asking how to forge aspect of death to realizing both version (or the new client together) cannot Presentation: No place to press forge for any Legendary runes Steps to reproduce: Go in to any runes details page and you will not find the forge button reddit post: https://www.reddit.com/r/Poxnora/comments/6d5rdo/how_do_i_earn_aspect_of_death_rune/
Known bug that crafting legendaries from the client does not work. From the site you still can if you are a PC player.