Necro Dungon Builds
https://forum-en.gw2archive.eu/forum/professions/necromancer/Necromancer-tutorials
Here are a list of builds including the hybrid one you were talking about.
Honestly, Necro build efficiency depends on the rest of the team. Axe/Focus power build is excellent in a team that is high in the straight damage department, but terrible for one that is condition-heavy.
Condition necros and condition mesmers work very well together thanks to the lack of overlap with their damaging conditions and the Necro being able to spread the mesmer’s single-target love.
In general, I would suggest finding a more versatile build. Remember to swap your utilities (and some major traits!) out between fights in dungeons. Epidemic is amazing, but against Lupicus, it’s a wasted skill.