
Originally Posted by
Ceallach
Burn
MP Cost: Equal to Fire
Range: 25 yalms, single-target
Potency: 20 fire, 20 fire over time for 21 seconds
Astral Fire +1, weakens victim's resistance to caster's Fire spells by 50%
Frost
MP Cost: Equal to Blizzard III
Range: 25 yalms, single-target
Potency: 70 ice, 40 ice over time for 24 seconds
Umbral Ice +1
And done. With two spells, both cast instantly without aid, black mages are now more damaging and more mobile without supporting the party or vastly changing the rotation. The rotation would then be Blizzard III, Enochian if it's not up, Frost, Ley Lines, Blizzard IV/Thunder III, Fire III, Burn, Triplecast, Fire IV thrice, Sharpcast if you have it, Fire, Fire IV some more, Fire III if you have Firestarter, Convert and more Fire IV if you have it up, Blizzard III, Foul, repeat. Burn is slightly weaker than Fire so that Fire is still used as it is now, and Frost is another Thunder III but without Thundercloud. Considering it takes nearly 33 seconds to complete one rotation at 1339 spell speed without abilities or traits (I checked), higher tiers should be able to pull off even more spells easily and while moving. And this is just a concept that would work with black mage's lore, the FINAL FANTASY series' lore, and the gameplay functions that need to be addressed.
Adding up the potencies and potency multipliers, black mages do 5854.4 potency in 32.9 seconds now at 1339 spell speed, assuming Thunder III is allowed to wear off and you don't use any abilities besides Enochian, nor do you make use of traits beyond Firestarter the one time via Sharpcast. With Burn and Frost as I wrote them added in, that becomes 7953.2 potency in 37.9 seconds. Compare that to what a summoner or red mage can do. Granted, this assumes Astral Fire III is an 80% potency buff on Fire spells and 30% potency debuff on Blizzard spells, with Umbral Ice III doing the same debuff to Fire spells. This also assumes everything is multiplicative (as in Fire IV's 260 potency multiplied by 1.1 for Enochian multiplied by 1.8 for Astral Fire III multiplied by 1.5 for Burn where applicable). Because that's part of why the War of the Magi happened, and we don't want a Magi War II. Let's not do these things.