Grimmlokk
Ahn'Qiraj Raider
Farming normal dungeons for a specific boss drop is a recipe for pain. Just hold out for a dragon dungeon with Siren as a sub-boss and farm that. Especially when it goes 2x drop.
ADK is easy, just run his dungeon when it comes up. Unfortunately you apparently missed it when it was just up May 25th. Pops up almost every month though so it shouldn't be too bad. And you should be able to handle the highest difficulty with Kushi.
As for subs that you have right now, I'd probably just go with the highest HP stuff that will meet the requirements. Give you a bit more wiggle room for practicing. Stats aren't going to be too important if you hit the multiplier. And you can always pair up with a helper Kushi or Bastet. OrHorusorDQXQorIsisfor more relaxed color matching practice. OrKarinorGenbueven since their 3 required colors fit in.
Giving yourself that bit of leeway rather than NEEDING his 4 colors might be the break you need.
edit: Added links so it's less confusing. Keep in mind there's higher and lower evo's for these monsters, some of the higher ones change the requirements for their leader skills to make them easier/harder.
ADK is easy, just run his dungeon when it comes up. Unfortunately you apparently missed it when it was just up May 25th. Pops up almost every month though so it shouldn't be too bad. And you should be able to handle the highest difficulty with Kushi.
As for subs that you have right now, I'd probably just go with the highest HP stuff that will meet the requirements. Give you a bit more wiggle room for practicing. Stats aren't going to be too important if you hit the multiplier. And you can always pair up with a helper Kushi or Bastet. OrHorusorDQXQorIsisfor more relaxed color matching practice. OrKarinorGenbueven since their 3 required colors fit in.
Giving yourself that bit of leeway rather than NEEDING his 4 colors might be the break you need.
edit: Added links so it's less confusing. Keep in mind there's higher and lower evo's for these monsters, some of the higher ones change the requirements for their leader skills to make them easier/harder.