Weapons:
Blessing of Lustrous Carmine - Best in Slot
Beacon of Duty - F2P (Battle Pass)
JET - 6-Star Alternative (Personal Damage)
Blessing of Lustrous Carmine is, essentially, the
Thermite Cutter for Polearm users. The ATK% buff activates whenever the wearer recovers SP, so any future polearm vanguard can use it. The only downside is the Ultimate Gain Efficiency, which is tied to the weapon Potential. This means that unless you're going for dupes, the weapon will only provide 28.8% Ult Gain Efficiency. Meanwhile
Beacon of Duty can provide 46.4% at a single copy.
But
Beacon of Duty effect is much worse than
Blessing of Lustrous Carmine, it only provides Physical and Heat DMG for the team.
Rossi makes a better use out of it, but pure heat characters, such as
Laevatain won't benefit from it that much. Depending on what weapon you decide to use, you'll need to adjust your gear to the desired Ultimate Gain Efficiency breakpoint you are looking for.
JET is the only 6-star alternative worth recommending but it's purely for Camille's personal damage.
Chimeric Justice is a 5-star F2P alternative, but honestly, you should save crystals and get the Battle Pass, you don't need multiple copies for the maximum Ultimate Gain Efficiency, and the stats/effect are much better.
General Use
Gear Set:
Frontiers
Body:
Frontiers Protection Suit /
Frontiers Armor T3
Gloves:
Frontiers Fiber Gloves T1
Kit 1:
Frontiers Extra O2 Tube T1
Kit 2:
Frontiers Extra O2 Tube T1 /
Redeemer Seal
Frontiers is the best option for Camille, as it provides a much needed Combo Skill Cooldown reduction, good stats and a team buff. You can adjust your Ultimate Gain Efficiency as needed, depending on the weapon that you're using. For
Blessing of Lustrous Carmine,
Redeemer Seal and
Frontiers Armor T3 are recommended, for
Beacon of Duty,
Frontiers Protection Suit and
Frontiers Fiber Gloves T1 gives enough Ultimate Gain Efficiency for 6s3c.