You need to excuse Baked. Sometimes he has a brainfart and mixes things up. I believe he meant AKHMA cave which should be a place you remember from your earlier days here.

Ash is an instance dungeon you can go to for leveling intermediate level characters. Instance dungeons are fairly new to Rohan only in the last couple years. When you go with a party you get the whole place to yourself and can't get pked there. Most instance dungeons like that are available only to parties though and I believe you can only go once in a 24 hour period.