Type as Parameter, and string[] from Linq

private static string[] GetRolls(AgentHitbox agentHitbox, Type type) =>
  agentHitbox.agent.GetTraits<type>().Select(t => t.Rolls);

private static string[] GetRolls(AgentHitbox agentHitbox, Type type) =>
  agentHitbox.agent.GetTraits<type>().Select(t => t.Rolls);

1. How can I use type this way? Typeof(type) didn't work either.
2.

Rolls

Rolls

is a string[]. I need to concatenate it from the series but I haven't done that in Linq before. How do?