at lv18, already can start shoving abilities/spells on the 2nd bar, can add like 1 ability to the bars every other level for class, at 18 I got like 25 usable slots i think it was.
I use spells for emergencies like.. say on the moles at bloodshore and you aggro one those rose things and it starts spamming its 100 damage shot, can stoneskin/regen it off without any worries.
Stoneskin is like 8mp and regen is like 10-11, mana costs are low enough its not terrible especially having 200+ Mp at Lv 14 lancer. Also I think you can use the TP-> MP ability of term? also for Mp recovery.
overall it really helps on guildleve's/oh shit moments.
not exactly making 1 "superior" job, its more like mini support. Since you have almost 1/2 the power of it sj'ed then as a main. Its more or less "helpful" in extreme situations and or speeding alot basic stuff.
Like.. if I'm fighting 2 mobs that are hitting me for 50's... and they get stunned for 1-2 sec when they hit (if they hit because of feather foot helps noticeably) and my hits drain 20-30hp a hit... and then 1 readies one those WS's that "could do 120" and stoneskin/regen the damage off etc etc.
just an example but as you can see the other jobs are more of a "helper" then a /omgrapeeverything but yeah.. vs someone thats only lvled 1 job.. it is technically superior (especially with multiple +damage buffs).
Its basically just like ffxi sj's... just you can have all the sj's at once instead of 1!
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