Ok here are the items price's in order
The Ultimate nightmare - 1uc
Dark converyor - 1uc
Darkness wall - 1uc
Dark Fire crystal mine - 2uc
Massive dark matter mine - 5uc
Dark matter wall - 2uc
Dreadful cell - 4uc
Dark zombie - 3uc
The Haunted gate - 5uc
Darkness tree - 4uc
NOTE: All items are premium and cheap.
Here are ore values
Dark Firecrystal - 100OcTG
Massive dark matter - 900OcTG
NOTE: WHOA! Dark firecrystal ore and Massive dark matter are the most values.
Here are effects of items.
The haunted gate - Multiplies by 900OcTG
The Ultimate nightmare - Processes ores at x9OcTG it's value
Dreadful cell - Processes ores at x9OcTG it's value
NOTE: Both The Ultimate nighmare and dreadful cell can process ores at x9OcTG it's value. And this one's The Haunted gate multiples by 900OcTG.
Dark Zombie - Runs faster, chases them, and Kills nearby player with an explosion.
Here's the fastest conveyor is Dark conveyor which is conveyor speed is 2000% faster than hevenly conveyor.
NOTE These coneyors and ore upgraders are the fastest. Also Dark Zombie is the fastest and the deadliest zombie ever that explodes by killing the player.
And now this Darkness crate and the items will be added in holiday 2016 update.