When talking about treasure hunt, the first thing that comes mind is mostly "it will cost Diamonds". Of course it cost Diamonds, but it is well worth it! 250 Diamonds for each Treasure Hunt, and there is a bonus chance after a period. 10 Draw will cost more Diamonds.
However we recommend the players to collect sufficient Diamonds or Treasure Scrolls before proceed to the 10 Draw, this is because you can 100% get a Hero or Hero Part through 10 Draw whereas there is a low possibility to get Hero by 1 Draw.
If you gain an Epic Hero, you can save a large amount of Stage-up materials. Other than that, all the skills of the Epic Hero are unlocked. So, it is really worth it for the 10 Draw.