Do the dual quest. It's much more efficient (time wise and material wise).
Also, Helios Z isn't the best set considering it has -35 dragon, and 90% of Stygian's attacks are dragon-based.
I haven't tried lancing him honestly (GL or otherwise). He's pretty dang fast.
I did just make the Agnaktor Z though for my primary lancing set (Guard +2, Guard inc, and Mind's eye is just too good to pass up). You'll still need dash juices though, as his dragon orb attack depletes stamina like nothing. --- We trained harder than you today, and we're gonna party harder than you tonight. Mint with the crew.
The dual quest took me 45min to do and carted twice tho. :/
Maybe try not to evade lance him ;)
With the GL, and being that it's noticeably slower than the lance and lacks proper hops, you're better off with a guard set. (make the Z set as I suggested and just block everything).
You're better off doing the dual quest, that is if you want a Skyemerald. (More carves, less health, better rewards). --- We trained harder than you today, and we're gonna party harder than you tonight. Mint with the crew.