There is only one focus item. As you complete the various quests you can change the focus of the focus item by right clicking it from a main inventory slot and then sticking it back in your inventory. I would assume that the caster would work without the focus with the exception that you could no longer choose the effect.
Any of these quests that involve fighting are generally geared around your level. The mobs you spawn generally con dark blue to you, so the fights are pretty easy. However, you have to be I think it is 54 or 56 to finish them all, because 4 of the avatars are in Plane of Tranquility.
i have just finished the Karana quest and got this item it says, it is suppesed to cast an aura around the caster... but i have tried casting many times and it has done nothing. if anyone can explain to me if we have to finish all the quests or if there is something we have to do. thank you
It does cast, but its way over your head ... look up:)
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In order for it to work you will need any of the Firework Focus items found Here. Each Focus item will display a different color aura. Also obtained through the gods tasks.
I have both the caster and the focus in my potion belt, click the focus first nothing happens. click caster, then focus, nothing happens. it shows me go thru casting motions, and says i light a firework, but there are no particles. I have all my particles and effects turned full on to see them, and there is nothing happening.
You may need to change your view. First Person or even a little scrolled back (looking down at your character from behind) often does not allow you to see the effects going off OVER your head. Also make sure your particles are on. Same thing happened with the fireworks reward from the 5th Anniversary.