I thought that the early scene ( in the first release ) where
Atlas single handedly killed 4 werewolves from the Crimson Pack already showed how strong he is.
Also, he killed the Asia vampire leader ( Wu Tang or whatever his name is ) by himself on his own ( if player didn't go with the strategy suggested by
Leyala ). That is pretty strong one man show.
He went to the Blue? Moon Pack accompanied just by
Leyala, no army there. I am pretty sure at that time he didn't know the pack will be on his side and he will meet with the other 2 LIs there. It is still risky.
He went to meet
Keros by himself ( or accompanied by
Leyala ) although there is no guarantee that old man will not be hostile after what had happened 400 years ago.
He went to
North America to confront the wolfs, who basically ousted vampires from NA ( accompanied only by his 3 LIs and 1 harem member ). Player can decide if
Atlas going to be ruthless where he killed a few wolfs to establish dominance or not.
Pretty sure I missed some other cases, considering I only played up to
v0.14.