Talk:Nekros (Warframe)/@comment-140.0.38.248-20130916113857/@comment-15661029-20130917155835

You have to kill a new set. the "souls" are stored as you kill, up to 9 (with maxed focus) as you go over nine, they will start to overwrite each other (oldest gets overwritten). After the skill is cast, the "soul count" resets to 0, and you must kill a whole new set of enemies to collect the "souls". However, you don't have to wait for the current active cast to wear off, it begins counting again immediately after the cast.

I will actually add this info to the skill description.

I just run around with strun wraith with him and it stays up all the time.