Just went to Chant kite in PoD tonight and pulled one of these buggers. It was not hard to chant it down to 5% life and then bam! it heals to 50% of its life. So I figured well it may only be able to do that once so I keep at it with chants. All in all I had to zone after it healed itself six times.
Just had to add this so no other chanting bards don't waste time or have BBB memmed to finish it off with.