I started with about 10M now I have 22M
I merchanted Glories (4)
Bought them for about 750 Under market.
Sold for Market the next day.

(vvv Must have finished Heroes' Quest for this vvv)
If you're bored and want to speed up the process, buy normal Glories (0) (for about 750 under market) and some Games Necklaces & Rings of Duelling. Just tele to Games room, run to Heroes' Guild, recharge, tele to castle wars, repeat. Then sell the Glories (4)
at market.