Wraith Form
Explorer
Then there is the consideration of how many encounters the group will have faced before the encounter and how many more encounters they are expected to face the same day.
Understood.
This is the very first encounter, kicking off the entire pulp campaign. I'm being intentionally vague regarding most details because I suspect a few players may be lurking on these boards, but I will say that after the encounter with the "thug 'bots" the party will have several hours, possibly days, of rest before they need to fight anything more.