Runes of Magic US / AU

Here is some info for you to read on them:
Standard Aggregator: http://www.runesdatabase.com/item/204073/standard-aggregator
Advanced Aggregator: http://www.runesdatabase.com/item/201607/advanced-aggregator

Basic premise is that you use these to turn gear/weapons into different looks.

Hope this helps.

It lets you merge the skin (appearance) of one item with the mechanical stats of another item. Say, for example, you have Sword A and Sword B. You really like the look of Sword A but it's not a particularly good weapon. Sword B is a freaking awesome weapon and you'd like to change its skin so it looks like Sword A while maintaining the damage, stats, dura, etc. of Sword B. This is where Aggregators come in. The Standard lets you merge "like" items like a 1-h Sword with another 1-h Sword while the Advanced lets you merge "unlike" items like a Sword and a Staff.

They come from the cash shop.

It is not 8 diamonds, it is 7. 14 for advanced.

Might want to work on your spelling skills. While what you say is still readable in forums in context, when you are searching for answers to your questions in NPC search, runesdatabase or item shop, you need to spell things properly or you wont find the information.

An aggrogator is a really pissed of alligator that aggressively eats dogs and little children. Ordinarily it winds up getting shot to death.