Aurora: Awakening, Siren's Landing Master, Horrid Residue

[Magische Boek.2530]

Somehow, i dont know why, this achievement seems to be bugged for me.

 

The hint sais:

 

"Obtained after defeating the horrid illusion in Siren's Landing."

 

I've now killed it 12 times and still no Horrid Residue. 

This seams really weird since every other bosses dropped the item instantly. And i don't mind having to kill a boss a couple of extra times. But the whole event chain from start to finish is annoying.

 

1. You have to kill a Illusionairy beast. In order to damage it, you have to break its breakbar first. This is fine when you're solo. But if there's even 1 person afk on a skyscale nearby, the event scales to insane levels where you have to deal 10x the CC in order to break its breakbar.
2. You have to chase this monster all around Lyssa's Reliquary in Siren's Landing. It jumps trough portals to get away from you. 
3. Then there are Vigilant Phantasm's nearby that cast the mesmer reflect bubble LITERALLY every 5 seconds. I'm playing as a thief, and most enemy's die to 2x unload, But you simply do not have enough time to unload twice because its bubble will be up again. Stunning the Phantasms is pointless because they will use their bubble anyway. Even if their bubble animation has ended, they will still reflect projectiles for a bit. If you manage to kill them, they nearly instantly respawn.
4. After you killed the beast, you get to fight the Horrid Illusion. Cant complain too much here, it's just very difficult to kill this one solo. But hey thats why it's a champion right?
5. After you killed the beast and didn't get the item, you get to wait half an hour or longer to retry.
6. Several people have come by, who also needed the item. All of them got it on their first try.

 

Is there anything i can do to increase my chances of getting the item? I really think its bugged for me.

 

 

Pre-event:                 https://wiki.guildwars2.com/wiki/Defeat_the_illusory_beast

Horrid Illusion:        https://wiki.guildwars2.com/wiki/Kill_the_horrid_illusion

Horrid Residue:       https://wiki.guildwars2.com/wiki/Horrid_Residue

Vigilant Phantasm: https://wiki.guildwars2.com/wiki/Vigilant_Phantasm

[Magische Boek.2530]

For the 14th attempt i decided to switch to a different character. Got it instantly. 

[Inculpatus cedo.9234]

Ahh, you were probably experiencing DR, then.

https://wiki.guildwars2.com/wiki/Diminishing_returns