Either
-5x Julianos: Craftable, reliable, and offers good damage in all scenarios. Tends to perform best in unorganized groups. Not as high potential damage with Warhorn buff.
-5x Twice Born Star: When running trials with good Warhorn uptime TBS has the potential to perform better than Julianos. Use the Shadow as your second mundus.
-5x Burning Spellweave: It has the word "Burning" in its name. Its us. This setup peaks the parses, beating all other sets. Start farming City of Ash, incredibly high proc rate with everything we cast being fire damage.

2x Grothdarr: Crazy damage with high proc rate, and works well in boss fights because we're melee.

4x Infallible Aether/Moondancer: An extra 5% damage for dungeons and trials plus a bit of other stats goes a long way. Moondancer is different to Aether, but they're both basically as strong for most content. Long as you have three jewellry and Sharpened Staves you will do good.

Twin Inferno Staves: You'll want to go double here as we will want to use as much fire damage as possible. Use Sharpened weapons, the difference between sharpened and other traits is insane at the moment. A non set Sharpened staff will outperform a precise or nirnhoned Maelstrom staff, even on back bar.