I know it's over 200. But while lvling I didn't get much skill up to say the least. Maybe 1 on both staff and sword but it may just be because I suck at hitting staff is 212 and sword is 207 I'm lvl 63 pld.
Ranger63/Ninja27 (yeah, gimp subs rock), soloed 3 of these while I was waiting for a party to take me in. No matter how much damage I dealt, if I passed through water, the Processionaire lost my scent. Water takes up your scent, so any mob that pursues by scent will lose your track when you step into water. Not a glitch, just use your surroundings to your advantage.
This thing seems to pursue by scent. Several times our puller lost aggro when running over a pool of water; even after provoking or throwing a ranged weapon at the mob.
All mobs start to lose agro if they or you run through a pool of water or cast deoderize. Depending on the enmity build up, you will have to stay further and longer out of agro range though.