What means "take over management of runes of my troops"?

[Handel]

The Valkyrie should take the usage of the runes of every unit. As it is bugged it doesn't work. Besides once you stop forgetting about runes, you should start to appreciate them. For example the attack rune gives not only attack, but critical chance too. Artifact or two + the attack rune +hero skills + high critical chance troops easily gives over 70% critical chance.