EX job feature is added to the game with the 1st year memorial update.
What is EX Job?
You can perform unlocking EX job for units whose main & sub jobs' levels are max. It can only performed on main jobs.
By unlocking EX job, that unit's ability board is expanded. Grids on that ability board has effect like unlocking a new ability, enhancing existing abilities, and raises max level cap.
How to Get EX Job Materials
Unit Vision Pearl
You can get this item when you obtain units or units fragment for a unit who is already max limit-broken. You'll also obtain vision medal as usual.
After the update, new challenge mission is added and you can get 1 Rainbow Jewel by complete the missions. This is the only F2P way of obtaining Rainbow Jewel. You can also purchase Rainbow Jewel at Special Shop. It costs 10,000 JPY on the JP server.
Abyss Flower of Paradise
Abyss Flower of Paradise can be obtained as item drop from Super High Difficulty Training Chamber and Elemental Pyroxene Chamber Lv.6.
You can get only one by month from Super High Difficulty Training Chamber A, B, or C (If you get one from Chamber A, B and C also don't drop the item this month). You can get one by month from Elemental Pyroxene Chambers as well.
Weapon Scorchmark Stone
Super High Difficulty Training Chamber is added and you can get Scorchmark Stone of each weapon as item drop.
Elemental Pyroxene Statue
Pyroxene Chamber Lv.6 is added to each elemental Pyroxene Chamber. You can get the item from the quest drop.
Completely false that you need IRL money. It's the same way that Sins are handled in TAC, if you're F2P you just need to be picky at first, after a while you'll have a lot of them. Literally a 1.5 year after they came to TAC I can enlighten almost 30+ units and still have left over lol.
Everyone is gated even whales cause those rainbow bundles aren't infinite.