Necro Cave

It is an island unlocked after defeating the Mammoth in Wildland. It consists in five floors and an infinity stage. You may complete these stages with a team of 10 heroes and the Unique Animals. You can have up to 3 skulls that allow you to enter the Necro Cave (you use one skull to enter). Each skull refreshes after 20 minutes. In these stages, you have access to three abilities:

-Meteor ability: Summons a rain of meteors that deal damage to enemies. It costs X bones.

-Storm ability: Summon tornadoes that stun enemies. It costs X wings.

-Healing ability: Heals partially all your characters. It costs X claws.

After clearing each floor you unlock the next one, while the infinity stage is available since the beginning.

Normal floors
In these stages, you have to defeat 23 waves of zombies. You control your heroes and the Druid doesn't move. Some Bomb Bugs and Goats (which only attack the Druid) appear too. The cost of abilities increases depending of the floor: the higher the floor, the more they cost.

-When clearing the first floor and after hitting the cage 10 times, you get the Bomb Bug, 7,500 gold and 15 diamonds. The next times you get 100 gold and 3 diamonds.

-When clearing the second floor and after hitting the cage 10 times, you get the Cave Bat, 10,000 gold and 20 diamonds. The next times you get 200 gold and 3 diamonds.

-When clearing the third floor and after hitting the cage 10 times, you get the Rock Snail, 12,500 gold and 25 diamonds. The next times you get 300 gold and 3 diamonds.

-When clearing the fourth floor and after hitting the cage 10 times, you get the Monkey Duo, 15,000 gold and 30 diamonds. The next times you get 400 gold and 3 diamonds.

-When clearing the fifth floor, you get the Golem, 17500 gold and 40 diamonds. The next times you get 500 gold and 3 diamonds.

*** In the fifth stage, after clearing the 23 waves, you fight the Golem.

After clearing a stage, you will receive a certain number of materials, that depend on how any enemies you have killed, on what type of enemies you have killed and on how fast you have cleared the stage.

Infinity stage
In this gamemode, you have to protect the tree of souls from endless waves of zombies. Each wave consists in 111 animals. Every certain time, beetles (which aim directly to the tree of souls) and normal beasts (some of them can be tamed) appear. Each ability costs 1000 of their corresponding material. After clearing each wave, you get 3 S.P. (you can get another S.P. by watching an add), which can be spent in upgrading several skills:

-ATK up: Increases attack by 0.2% (1 S.P.) (Max level: 30)

-HP up: Increases health by 0.2% (1 S.P.) (Max level: 30)

Nexus HP: Increases the HP of the tree of souls by 4500 HP. (1 S.P.) (Max level: 30)

Meteor hability: Increases damage of the ability (1 S.P.)

Healing hability: Increases healing of the ability (1 S.P.)

Stunnng hability: Increases the time the enemies are stunned (1 S.P.)

Discount: Reduces the cost of the abilities by 2% (1 S.P.) (Max level: 30)

S.P. Bank: You get 1 more S.P. at the end of the next wave (The cost of this ability is equal to the S.P. you had right after clearing the last wave. At the end of the next wave, you get all the S.P. spent in the ability and 4 S.P.)

1 Wave Phoenix (Lv 10): Summon a level 10 Phoenix for the next wave (5 S.P.)

Recover HP: Recover HP to all animals (25 S.P.)

Revive Heroes: Revive all animals (50 S.P.)

Top tower: Summon a tower in the top part of the stage that deals damage to all enemies at a short range. After clearing a certain number of waves, they level up, having more HP and more ATK. It can be moved (8 S.P.)

Left tower: Summon a tower in the left part of the stage that deals damage to all enemies at a short range. After clearing a certain number of waves, they level up, having more HP and more ATK. It can be moved (8 S.P.)

Right tower: Summon a tower in the right part of the stage that deals damage to all enemies at a short range. After clearing a certain number of waves, they level up, having more HP and more ATK. It can be moved (8 S.P.)

After the tree of souls is destroyed or leaving the stage by pressing the Home button, you are shown 5 dark cards that show the rewards you may get. The background of one of them is golden. This card features a much better reward. After that, all cards are turned and mixed. Then you can choose a card, which will give you the reward. The rewards can be gold, materials, diamonds and even artifacts.

Bug
If you tame too many animals, after using S.P., the next wave may not start.