[Running 3.3.5. Testing Shattered Sun area and getting attacked by invisible Wretched Devourer and Wretched Fiends. How to turn them back to visible?]

I checked WowHead and make sure the displayid on both npcs are correct.  I thought they might have their modelid wrong but that is not the case.  Here is the quest from WowHead.  http://www.wowhead.com/quest=11523/arm-the-wards#comments

Apparently I have to loot something from the dead npcs in order to finish the quest and since they're not visible, I can't loot it.  Tried as I might, I checked on both unit_flags and unit_flags2's flag descriptions but could not find anything that makes reference to being invisible.  Guess I'm at a lost.

Tried with the most recent version TrinityCore rev. 1841752acb00 2017-06-05 01:36:04 +0200 (3.3.5 branch) (Win64, Release, Static) (worldserver-daemon).

Thanks for any other suggestion.

[Running 3.3.5. Testing Shattered Sun area and getting attacked by invisible Wretched Devourer and Wretched Fiends. How to turn them back to visible?]

It's from an revision a few days back...  TrinityCore rev. aa6cd460eecb 2017-05-29 20:12:11 -0300 (3.3.5 branch) (Win64, Release, Static) (worldserver-daemon) ready...

I guess I can update to the latest version and see if that makes a different.

[Running 3.3.5. Testing Shattered Sun area and getting attacked by invisible Wretched Devourer and Wretched Fiends. How to turn them back to visible?]

As title suggested, was running around at the Shattered Sun area and trying to do a quest called Arm the Wards!.  It require the killing of Wretched Fiend and Wretched Devourers.  Unfortunately they're invisible and when I run around the area, they will attack me but I can't see them but I could attack back as long as I'm pointed toward the npc's direction.  Was reading up on Creature_Template in the wiki but could not find the right entry to edit.  What control whether a npc is visible or not?  Unit_flags or Unit_flag2 and what is the value for it?

Thanks for any assistance.