A battle of guilds in Ragnarok Online in which you attempt to capture a castle that is near-impossible to get unless you have alot of Icepicks or Precasters. If you do capture a castle, you'll only have it for about three days, unless you're lucky.
In iRO, WoE occurs on Wednesdays (3-5 PM PST) and Saturdays (7-9 PM PST)
Before War of Emperium, make sure you get an infinte supplies of White Pots. Or Priests.
DURING WAR OF EMPERIUM:
Guild 1: lolz we liek gunna pwn Valk 2dey
*Apparently 5 seconds later*
Guild 1: wtf hax y dey got big precast