Explore the dark caves worth it?

[WendyCroy]

I tried the dark caves just once. Here is what I have got :
1 royal beam
1 enchanted block
800 coins
4 glimmer dust
1 mithril
3 gems
1 dark cave formation
Wisp lantern
10 energy

[Starlitstream]

I've searched the caves twice. The second time I received a Royal Pig.

[nokkha]

1st time I got 15 energy, royal beam, 3 gems, 1 mithrill, coins, 3 earth wisp and a black cow ^__^

[FridayFreckled]

I've done it three times, and I can't remember everything I've gotten. But on one of them I got a black cow, and a pink pig on another. Gems on both, assorted other items, lots of energy, and a ton of coins. I definitely think it's worth it, but I too am alternating between the dark caves and bandits so I have time to build wisps for expanding too.

[charissalim]

what is the cost to speed up 'Explore the dark caves'?

is it also random thing which it is different cost for everyone?

[jefframone]

I got some neat stuff. A rock mountain that gave lots of jewels some royal cows and blocks

[zombiefun]

Never has anything nice. All my statues, pigs, sheeps and trees came from first quest.

[Tassle23]

Just got royal beam, enchanted beam, glimmer dust, 10 energy, 10K coins, silver ore, earth wisp, and.... a unicorn statue! I love the dark caves quest.

[Rockinkitten]

I only did it twice. Once to see if it was worth it, and once when it was a goal! I don't like using my wisps on it.

[WendyCroy]

Very disappointed for the second try :
1 super glue
1 enchanted beam
3 GD
6 earth wisp (it costs 10 to do the quest)
24 energy
1 dark cave formation

I stop the quest as I need earth wisp to expand and build the cathedral.