How to examine .NET assembly without using reflection

Let's say, we have class Base, and Derived, defined in Base.dll and Derived.dll respectively. Derived is derived from Base (may not be a direct sub-class though)

The problem at hand is, if we have Derived.dll at hand but Base.dll is missing, how to programmatically examine all the types in Derived? e.g. to know what types are available, their accessibility, inheritance relationship, etc

Based on my understanding, reflection (things in System.Reflection namespace) is not an option here because GetTypes() will try to load Base.dll which is not available, thus throw ReflectionTypeLoadException.

In particularly, is this something that can be easily achieved using Roslyn, or some good library?