Hmm, I'd put that somewhere between Diplomacy and Intimidate. Nevertheless...
The crew is shocked for a few moments, and they maintain relative quiet while Marcus is talking. When he finishes, Robers steps forward and spits on the deck. "That's no passenger. That's an monster. You go ahead. Gather your details and pretend it was an accident. I know better. That thing murdered Tinker."
At that point some of the other sailors shout their assent. Hector, Benjamin and a few others stand quietly.
As Robers stalks away, Jella speaks up, "We'll keep the peace for now, but none of us want the illithid getting back on the ship once he reaches his precious destination. The sooner we get there, the better, to my thinking."
The crew disperses as Grillon rests and prepares spells. As the day cycle begins, the ships destination appears in the distance: a ovoid asteroid about 250-feet long. You've seen ships that are bigger than this piece of rock.
Questions for the dead?