BLM

[Sandkat]

If you can only pull from two classes for additional abilities... Lancer and Archer seem to be where it's at... combining their abilities gives you 40% extra damage (Blood for Blood and Raging strikes, respectively ((if they stack)), on a three minute cool down and an emnity mitigation ability (Quelling strikes) that will prevent the 25% extra damage taken from "Blood for Blood" from making you a drooling puddle of arcane punching bag.

For THM (or any base class): You can pull from ANY other base class.

For BLM (or any JOB): You can only pull from 2 specific classes.

I don't understand why you would start with B3 under any circumstance except starting a fight OOM.

B3 kicks in immediate Umbral 3 followed up by Thunder 3 for dot ticks (Thundercloud proc chances) while keeping your MP at full. Then its into the Fire 3 (Full Astral) -> Fire 1