So many people have already got their Crystal Phoenix from the quest ''Juggernaut Items of Nulgath''.
With that sword you can do the quest ''Fighting Phoenix Blades'', wich gives you 100.000 Gold and 13.000 XP.
It only requires 10x Gems of Nulgath (Reward from the ''Nulgath (larvae)'' quest) and 1x Nulgath Rune 7 (Dropped by Dark Makai).
If you have farmed enough Gems of Nulgath, you can gain 1.000.000 Gold in 3 minutes.