Omen's ult is not that useful except in going to order sites quickly or getting behind enemies(that too most time get blocked), so it will be cool of he could use his ult to get the spike and then return safely.

After scouring the web I’ve yet to find an actual definition of the term and so I’m still a bit confused by it. People say agents with them are harder so I might want to avoid those to begin with, so which are they?