Countess Surin Skenobar

One of the first 3 bosses in the Foul Cascade, the Countess uses a gun and teleports around 3 to 4 times while shooting random people. Only occurred once during the fight.
 * quest1=Corrupted Queen

Tactics
Spread the party out in a fan shape around her present position and have the tank engage her in place.

When she charges a player they will need to immediately move, since she will drop a barrel in that position which will shortly explode for large amounts of damage.

Heal through the damage from her barrage skill. This is apparently a fan shape from her towards the current aggro target, which should be the tank - don't stand between the two of them.