Help with choosing a class (sort of)

[Estellios]

Conjurer is by far the most useful class to level up for abilities to complement your main class. I'd recommend getting it to at least 18 for the immensely useful Raise. Cure scales as you level and is decently powerful even if you aren't a CNJ, so you can backup/emergency heal while on THM if you have it. Leveling CNJ also gives you Aero and Stone for some added nuke elements/debuffs. If you want to go even further, Stoneskin is at 26, and Sacred Prism (Which lets you AOE your next healing or buff spell) is at 34, but they aren't as necessary as Raise.

Aside from that, getting Pugilist to 6 nets you Second Wind (Heal a good chunk of HP at the cost of some TP) and Featherfoot (raises your evasion temporarily, the next attack you evade gets rid of the effect but grants you some MP). Also, Sentinel is 22 Gladiator, and while not as nearly necessary as it used to be, is still nice to have for some endgame fights and Soloing.

There are probably some other abilities you can use, but you should look at your Abilities menu and see what you can find there. Anything that isn't restricted to one class or Disciples of War you can use on your THM. You can see what every class learns and at what level in that menu so you can plan accordingly. Usually the most useful abilities are gotten by the low 20's at the latest.

But uh.. yeah I'd really recommend leveling a few classes on the side, at the very least for extra abilities. You might even end up liking one.