Recommended cross-class skills for the tanks?

[SpookyGhost]

SW > Flash 99% of the time. The last time I remember running Flash was T10. It's a waste of a GCD if that GCD could've been filled with literally anything else and have the same result. It's not necessarily a detriment in dungeons, but generally you won't need it.

Something else to keep in mind is that WAR has access to 5% Mantra which also has situational uses, mainly for early prog. Sometimes I'll run Mantra in place of SW or Awareness in PUGs to help with AOE intensive parts of fights where I can't trust the melee DPS to pop it. If you don't plan on leveling MNK all the way to 60 I'd recommend just not bothering, though, especially since it might be gone in 4.0.

Also Mercy Stroke > Raise outside of PotD (even in PotD you shouldn't need it b/c Phoenix Downs or just use the Revive...statue...thing). Raise will only be used in extremely situational circumstances, whereas Mercy Stroke always gets used multiple times in one run. However it is very little +DPS, and outside of EX Primals/Savage it really won't matter too much if you don't crossclass it.

e: Oh right, for WAR, don't forget about Featherfoot. While it is complete garbage in EX Primals/Savage, it's actually pretty decent in dungeons. Just make sure not to use it in conjunction with Vengeance b/c now you're missing the 50 potency procs every time you dodge. Featherfoot is also super strong in solo content, especially since Convalescence becomes literally useless when you don't have a healer (has no effect on Bloodbath, SW, Equilibrium, etc). Provoke is also near-useless solo but there's nothing worthwhile to replace it with.