Useful cross job abilties?

[Zumi]

Well I got my gladiator to 48 now. Anyone know useful abilities from the other jobs I could possibly get to make doing guild leves easier?

[Delmontyb]

I'd vote for cure, protect, stone skin, those more then not if you are playing solo. MRD has good skills for tanking, and lance has good skills for DPS. I'd play around with those classes and find a build that works well for your play style

[ShellQ8]

(Lancer)
Invigorate: To get TP

(Pugilist)
Second Wind: To heal yourself

(Marauder)
Bloodbath: To get HP from your actions

(Conjurer)
Cure / Protect / Stoneskin

(Thaumaturge)
Sanguine Rite: MP in proportion to damage taken

[AceofRains]

Second wind, cure, and protect are a must have solo IMO. For solo I kinda don't recommend bloodbath, I think it's a was of a slot, but then again it negates the HP loss when I use blood for blood.
Hmm I haven't played GLD really but I think some MRD skills would be good
Get invigorate for sure so you can pull of more combos without stressin on TP. (lnc skill)
Actually on archer I use necrogenesis and aero, so I can try to inflict DoT and heal my self.
When solo i perform my actions kinda like in phases.

Phase 1 opening attack is stack blindside invigorate ect ect
And then launch attack from behind, for me it usually takes out like quarter to half health on
Somthing my level.

Phase 2 lay on the combos

Phase 3 is when I need to heal and buff up
Protect should always be on
Feather foot always good during this phase so your heals arnt chipped down right away
Then I pop second wind
If I need more health in I hit necrogenesis and aero
And and if I'm not set on healing by then I cure

Then it's back to phase one, if cooldowns are set
Or phase two, it's a situational judgement decision.

That's how I play tho :/

But i hope that helps ^^