Wanted to share some info about King Artho instance fight.
We got sucked in, like other Ls, our tank did not get drawn in, his screen went black and never completed zone.
We were left with several blms, rdm, a MNK and a few other DD.
It seemed like critical Hits were needed in order to do any substantial damage. All other attacks only did 1 dmg. Magic was the same way, it either did 1 dmg or spiked damage. We didn't have a single person with voke, and were limited to tricking on our MNK. This made it very difficult for any hate control. He seemed to use all the standard KA moves, we didn't get him low enough to witness Hundred Fists. We decided to reserve our weaponskills for the knight crabs, since they too regular damage.
As mentioned elsewhere, King Artho spawns Knight Crabs. We were not able to figure out what causes the crabs to spawn, but it seemed as though it spawned them without tp generation, however it was not time based. The knight crabs will cast Water IV on King Artho, which cures him.
Since we didn't have a regular tank with us, we weren't very good at keeping KA on the mnk. However it seems like he does not have a hate reset, however seemed like enmity didn't follow the same rules. Similar to a jailer of temperance, hate remained on the people who most recently damaged him.
We were able to Shadowbind, KA in order to rest. This will be important when he later uses hundred fists. THF/SAM, SAM/THF would be useful in this fight due to 100% crit rate with SATA as well as meditate isolated TP gain. Weaponskills can also be to prevent the knight crabs from healing KA, if magical stun is limited.
Anyways, hopes this helps someone out.