Well while looking at the list of raids in the world map I saw Orfen and Core and remembered this from like Chronicle 2 but back then I wasn't high enough. I would really like to try it, just wondering if these are similar to other raids where you can usually take down with 1 group or are these more of a bigger raid group needed? If so how many people do you need?
So you need more then one group yes. However, with that said, you could do similar to queen ant, in that they are lower level so you can stack gear, buffs (CoV, PoF/PoW, etc) and give yourself a far better chance with far less people then say Zaken would require.
I know Core is typically farmed, but I dont hear about Orfen too much honestly. Probably because her earring sucks compared to all the rest.
I've only done Orfen once. It was my first time in a clan and with a very large, albeit new and disorganized alliance. I don't remember how many times I died, but Orfen owned us that day. The alliance wound up collapsing not long after that, so I never had a chance to do that raid again.
Friends of mine who have done the Orfen raid successfully all say that she's not that hard to take down if you know what you're doing. But that is the case with most things...