Exp Grinding still at Harbinger?

So I know the old method was to go and fight Harbinger on Free Play Easy, but when you have XP boost is it better to just do the normal maps? 

Yup, its still the best/fastest XP / minute by a pretty big margin. Even the daily boost for completing different maps is not very close either.

Make sure you play with other players as that also increases the XP you get.

Don't forget to switch over to any heroes leveling in the background from time to time.  The xp sharing can temporarily break until you have made that hero active again.  Not entirely sure what triggers it but I ran into quite a lot of headaches multitasking 3 bissels at the same time in the background.

@roboticaust quote:

Don't forget to switch over to any heroes leveling in the background from time to time.  The xp sharing can temporarily break until you have made that hero active again.  Not entirely sure what triggers it but I ran into quite a lot of headaches multitasking 3 bissels at the same time in the background.

Yup, had this as well when I leveled my 3 abyss lords. They were all different levels even though  I started to level them at the same time^^

Thanks, everyone! It's so tedious, but I guess that's the way it goes.

What is happening is everyone is trying to eat a dinosaur all at once. Keep a lvl 1 ab lord in your deck and play how you normally play. It will slowly lvl up as you are playing maps. Of course having everything now is great but if you slow down you hit 2 birds with 1 stone.

What is happening is you are trying to lvl a pokemon by battling 10000 weedles. Instead of just equiping an exp share and playing normally