|Navarre's new weapon allows him to quickly charge deadly specials for the first turn of combat.
Navarre can choose from many specials, but his most consistent will be Luna.
Astra is another alternative if he's paired with someone who has Infantry Pulse 3 or Ostia's Pulse for a fully charged special.
If it can be afforded, Atk/Spd Solo 3 is Navarre's best option for the A slot as its activation requirement is quite easy to meet. Otherwise, Life and Death 3 or Fury 3 can work just as well.
Special Spiral 3 is another expensive skill, but it allows Navarre to always have his Special active (assuming it's a 3 charge special). Desperation 3 also works as a cheap alternative.
Navarre's C slot just depends on what his team may need, etc. One good, yet expensive option is Odd Atk Wave 3 as Navarre's Atk as well as his team's.
Navarre can use any seal that improves his combat potency such as Attack +3. Though if he runs a special with more than 3 charges, he'll need Quickened Pulse to have it fully charged.