Anyone have a link for a nice walkthough on this, anyone do it and have some feedback or tips? thanks a bunch!

You gotta do the Earrings of Veracity quests in Sanctus Seru. Get to the 4th earring and you can get the Arx Key. Unless im mistaken and you can just skip the earrings, kill the Praesertums (14 day spawns) and hand in the 4 shards for the key.

They are not even close to 14 day spawns...

I've been working on the earring for the last week or so, to say the spawns are fucked up is an understatement.

I believe they are supposed to be three days. However, they seem to just spawn at random times. I've killed one, and had him up 6 hours later again. Also, I've attempted one, failed, went to bed, woke up and he was down. Then, 2 hours later he was up. It just doesn't make any sense.

Oh my god, spawns that can't be timed!?

What injustice! =p~

1) Find Lcea Katta in Katta Castellum. Ask her "what arx key". She will hand you a jewel box then she will tell you to find Elnerick Augustleaf.

2) Go to Sanctus Seru. Go to each of the four Consilliums and kill the head Praesertum of each one. They all drop a shard.

3) Once you have all four shards, locate Elnerick Augustleaf in Katta Castellum. Hail him. He will speak a paragraph. After he has introduced himself, tell him, "I serve Katta." He will request you to give him the four shards from the Praesertums. Hand them in and he will give you the Arx key and a seal (seal is for the earring of veracity quests).

The Praesertums aren't that tough... just use pets to tank them, since they proc a banish which pets are immune to. Bikun is the only one that's remotely difficult, he's unslowable and flurries.

If you know someone capable of pulling the Prae leaders to the basement it's even easier as you'll be able to use a real tank.