For those of you who avoid the main Discussion board like a plague, There was a suggestion made by Jager regarding the following.
(Click on the little arrow if you wish to see the full thread).
My concept was stolen from his idea, so have a read of the original thread because it has some pretty nice ideas in there.
My evolution from his original concept was not to design a new job - but more to make a SCH meritable group 3 (or a lvl 99) Job Ability.
Transfusion would be a regular Job Ability in the regular menu, in which allows you to infuse the next 2x spells you cast into a more powerful spell. I am however not forgetting BLM's here, the "infused" spell should not out-damage a BLM nuke, however should be more like a potent enfeeble tied with a damaging spell.
This would in a way sort of work out like a normal WS Skillchain.
For example:-
Alderin uses Transfusion.
Alderin casts Diaga on Rani.
Alderin casts Bio on Rani.
Transfusion: Demi! Rani takes 1200 HP.
Rani gains the effect of Gravity.
(Obviously thats just a reasonably lame example)
Now why won't this destroy BLM and RDM's ability to nuke / enfeeble?
The damage caused by the transfusion would be a reasonable amount, but much less then what a BLM can nuke for.
The enfeeble would either be a less potent-longer lasting, orrrr a more potent-shorter duration then the raw spell itself.
After writting this, just considered the possibility that this idea could potentially not be a Job Ability for SCH, but a more of a "Skillchain" system for all mage classes - because let's face it, apart from Magic Burst - mage jobs miss out on the lack of "combo bonus".
So a BLM casts
Gravity > Drain = Demi (A damaging spell, which has an added effect of gravity)
Fire IV > Burn = Heat (Overheat.. A spike effect that damages the enemy if they use a WS/TP/Cast)
RDM might do something like
Paralyze II > Blizzaga IV = Frozen (A terror effect that freezes the enemy but also gives the enemy a temporary Ice Spikes til it wears - so melee can't hit it)
Could come up with some crazy combinations but in short - if it was based off the simple Skillchain system that weapon skills are already based off - so Element + Element = Skillchain.
If this however were to stay as a SCH group 3 merit, I believe that BLM being as powerful as it is now, and RDM being as enfeeble crazy as it already is - SCH could get a buffer like this without damaging the 2x original jobs.
Just food for thought, and would give the mages something to play with.
(Keep in mind the only mage job I have levelled is RDM, so this was more a manefest of ideas)