As a fellow gladiator/paladin, I STRONGLY recommend getting conjurer and marauder levelled up:
Conjurer:
  • Cure at level 2
    • Very weak, but can get you out of some sticky situations when used with convalescence)
  • Protect at level 8
    • Equally as good as a scholar's protect, handy when the healer isn't paying attention or when someone needs to be raised in battle, losing the buff in the process. Leave the protect to the white mages if you have them in your party though.
  • Raise at level 12
    • Limited uses for this, as you can't raise while engaged in battle, but kinda handy if you need to raise the healer after battle or if you spot a random dead person while wandering about.
  • Stoneskin at level 34
    • Definitely the best CNJ skill you have access to, super handy when you're off tanking and have a spare moment to stoneskin the main tank. Great for when you're tanking anything in general, and have a decent amount of hate established.


Marauder
  • Foresight at level 2
    • Another super useful skill to have. You don't get the MRD trait which shortens the cooldown time so rampart will still be your go-to cooldown, but it's still another defensive cooldown for your list, and 20% damage mitigation is great to have.
  • Bloodbath at level 8
    • This one's great too, even though you don't do a lot of damage as GLD/PLD, it's really good if you wanna throw shield oath on or put Fight or Flight on and can take a little bit of strain off of your healers.
  • Mercy stroke at level 26
    • This will give the enemy a good thump, and can make the last 20% of an enemy's life drain just that little bit faster. It's not as powerful as Spirits Within, and has no added status effect but it is off-GCD, so you might wanna grab this one early on and use it up until you get Spirits Within at level 45.


There are some others, but imo they're pretty useless. I personally have foresight, bloodbath, stoneskin, protect and cure on my cross-class skills and I use them in that order of frequency, the most frequent being foresight.