u/hypnoticbox30

Hi y'all. I am playing solo and would prefer as RAW of an answer and possible. I am a little knew so I still have a bit to learn

So I had a nighttime wilderness random encounter and it was a scorpionoid that was 140 yards ahead of my drow acrobat that was scouting ahead of the party.

Neither of us were surprised, and the scorpionoid was holding a light source

-in this situation would the monster even see me?

-do I have to roll or move silently or hide in shadows to be unnoticed?

-how would the rest of my party avoid this creature? Could my drow scout just got back and tell them to walk around him? Or do they have to do a stealth check?