well i tried the LoD beatle in Marga Coast by aggroing a group of beatles nearby then running to the monks group. Some of the beatles were healed quite well and others got no healing as far as i could see. So i can only assume he didnt heal the beatles from the other group. Whether is even casted LoD is questionable tho. I tried this with my ele and 2 monks and a W only. This means i didnt do insta kills and did enough dmg to force the boss to do some healing
gonna go re-try and this time kill all but 1 beatle in his team and then the same in the other party. Then aggo both to bring them together so theres a boss and 2 beatles (1 from his party and 1 from the other). I'll then set my heros to attack the beatle and watch the boss for LoD and see which beatles it heals. WISH ME LUCK !
EDIT:
tried it with a beatle and cournan guard. The boss never even healed the guard once and he died pretty quick with goren hacking away at him. The little beatle from the bosses party however, got the bosses attention all the time and koss couldn't kill him on his own.
now with the cournan dead i tried aggoing a beatle of the same type as the boss (also a monk) and the monk boss didn't bother healing him either. So doesn't seem to be a species thing as far as i could tell. as for LoD, the boss only seems happy to cast that when he's being attacked, not his party, so couldnt see if LoD was healing other parties. As i said tho, he didnt get any healing (no blue star effect of health gain) so if the boss did cast LoD at some point, the cournan guard didnt get any benefit.
It's just so hard to prove really but as far as i could see, LoD doesn't heal other aggroed groups at the same time. I'll keep testing and post if i do find somethin un-usual tho
EDIT EDIT:
got a cournan and a beetle by the boss again, but this time left my W heros hacking the 2 of them whilst i pounded lots of dmg on the boss forcing a LoD casting and the little beetle got healed but the cournan didnt.
u can clearly see the beetle with the blue star healing effect and more hp than the poor cornan on his hiney with no healing at all.