I can help with the main riff. Let's try using a constrained melodic range evocative of Horde's album Hellig Usvart (1994), Release and Clothe the Virgin Sacrifice:
```
F (quarter-note) -> F# (eighth-note) -> F (eighth-note) -> A, C, C# (quarter-note) -> G# (quarter-note) ->
F (quarter-note) -> F# (eighth-note) -> F (eighth-note) -> D, A (half-note) -> 
F (quarter-note) -> F# (eighth-note) -> F (eighth-note) -> A, C, C# (quarter-note) -> A Octave Up (quarter-note) ->
F (quarter-note) -> F# (eighth-note) -> F (eighth-note) -> D, Ab (half-note)
```
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