User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-79.119.70.247-20191030221210/@comment-79.119.70.247-20191101120622

Currently Ingvild has the ability to control lower level daggers, can not do something to an HD class Dragon, has potential, but at maximum potential I think he could not control Ddraig, at most he would weaken. And since Ddraig uses the boost ability of Ingvild's longinus, he has little significance. And a weakness of the longinus would be: since the enemy does not hear the song, he will be away from ability. Let's say the enemy breaks his eardrums, the ability won't work. And Issei being a hybrid, the ability will not work 100%.