The guard for the 2x - 5x battlegrounds are behind Item Merchant Nina in Elderine.
What are they called? They've all got abyss in their names =w= That's all I remember LOL.
There are a lot of monsters grouped together.
Normally from 4x battlegrounds onwards, you find a party and you AoE monsters or you duo/trio some. I don't know what happens at 2x battlegrounds, and I solo'd 3x battlegrounds XD
I found 1 green during the entire time in the battlegrounds LMAO. I've found a load of greens in regular maps. So maybe it's just my luck, but I don't look to find greens in battlegrounds.
When you're killed by a player, like when being killed by a mob you lose all your buffs + scrolls but no exp. Same if you kill another. You come at the respawn point in the battlegrounds.
There should be better drops than regular maps, but it depends on what you're going for. 5x battlegrounds drop a lot of dust, so that's good for stone production o-o
Hope I answered a few questions!