Night VFR
Thoughts and prayers are with the families.
Everything really sounds like a CFIT accident so far. Dark night, no reference, accident happened just after departing. The S76's IFR capabilities and equipment don't play a role during this critical part of the flight.
Having flown Air Ambulance both for CHL up north and Helijet out west there's nothing to see on these blackhole departures. Rotating into the ink from a towering takeoff and then transitioning to instruments in a nose down attitude with little airspeed and height the margin for error is very small. It's challenging for the most experienced crews.
May they all rest in peace...........