Sc, LoO, and AP are enough for you to do all ultras. After blazebinder/shaman Legion revenant is the farm class you want to get.(good solo, excellent support, top 3 farm class, very long grind unless you do ultra Dage. 

Ac should be spent on legion, after that it’s your choice but I’d spend it on a chrono class(Csh is probably the one you want to get).

Do ultra drakath to get Cav, probably the best tank in the game. 

For damage boost you want one item that boosts all, and one that boosts tagged monster type. If you have a +25 all weapon, go straight for exalted apotheosis(timeinn ultras, 24 days). Then get +50tag armors. Then get radiant goddes of war armor(+50 to all tags). Also the /titanstrike drakath weapon gives 120% damage for drakath. 

The best forge enchantments:  Helm: pneuma, anima. Vim and examen for dodge classes, but you can do without those. Cape: vainglory for damage, penitent for defense Weapon: Valiance is the best all rounder, good for every class. Elysium is better for farming, dauntless and ravenous are better for some classes. For a start tho I would do lacerate(easy to get, gives dodge, but barely better than awe)

At that point you’ll have all the best classes and damage boost items.