-Ja Spells

vs. using Ga Magic that starts gettin gimped after so many mobs ?

There's some info floating around, and I wanted to re-run some testing myself. I think some of it is new, some we already knew~

The -ja line of magic follows what you'd expect for -ga IV.
-The M Value is 2.3 (or 2.299), which is the same as Tier V line of magic.
-Base V on Stoneja is 719
-Base V on Waterja is 782

The target-reduction part of the calculation works the same as -ga:
-For 1 target, the term is 1.0.
-For 2 targets = .80
-For 3 targets = .75
-For 4 targets = .70
-For 10+ targets = .4 (The term's minimum caps at .4)

The "Successive use enhances spell potency." is a debuff which adds a new term to the damage calculation. It appears to be after Magic Affinity/Staff, and before MAB.
-It acts as an invisible debuff on the mob. (You will get no "wears off" message.)
-All mobs hit by hit by the -ja will receive the debuff.
-The term is 1.05, and gains .05 for each successive cast from the same -ja.
-The term is applied only to spells of the SAME ELEMENT. (ie; Using Stoneja and then Waterja or Blizzard IV does not grant a bonus, but using Stoneja and then Stone will get a bonus.)
-Successive casts done by different characters gain the damage bonus and can add to the potency of the debuff. (ie; Player A casts Waterja, Player B can cast Water and gain the potency bonus. Player A casts Waterja, Player B can cast Waterja and gain the damage boost and add another .05 to the debuff.)
-The debuff lasts 60 seconds with base duration. (ie; Player A casts Waterja, Player A or B can cast Water up to 60 seconds later and gain the bonus.)
- A -ja debuff of the same element will not extend duration. (ie; Player A casts Waterja, Player B casts Waterja 50 seconds later, Player A or B can cast Water up to 10 seconds later to gain the bonus.)
-A -ja debuff of a different element will overwrite any existing debuff and restarts the duration. (ie; Player A casts Waterja, Player B casts Stoneja 30 seconds later. Subsequent casts of water will recieve no bonus, and for 60 seconds, subsequent casts of Stone will recieve a bonus.)
-Goetia Chausses +2 (AF3+2 Pants) extends the duration of the debuff to 90s. This extension still applies even if the initial cast wasn't done in pants.

kinda disappointing more is the 1.0 for 1 mob and the decrease for additional mob , where with Ga you actually get bonus dmg on a single target

so its been shown to share multiple mob mod with Ga. kinda disappointing more is the 1.0 for 1 mob and the decrease for additional mob , where with Ga you actually get bonus dmg on a single target .i musta missed that post on BG . i'm still interested if anyone has tried some group play with these . there has to be some reason SE would give us this spell instead of Ga4 and 5 (some friends suspect we'll get Ga4 , i'm on the fence) . this one test may point to opening with Ja and concluding with Ga spells like workin-the-wheel on AM/AM2+T4/5 , especially vs. Mobs strong to magic or specific elements ?