Don't try to get Dread Knight yet.Try to get guilds on the early heroes and save ALL your hero souls.You will need to play for a loooooooooong time to get Dread Knight.You will probably get Dread Knight around lvl 250.I have 2600% hero soul DPS and 200% additional gold,but I still can't even get 3% of the cost of Dread Knight,even at lvl 220!