Erode allows you to accelerate time and weather an area of land as if water were shaping and eroding the rock.

 

Erode is first encountered on level 7: "Unseen Enemy" from a Stone Head, it is then claimed for permanent use on level 12: "An Easy Target" where the Matak hold it in a Vault of Knowledge. You can store a maximum ammount of 2 shots at once.

 

Erode can cause the Enemy's buildings to sink into the water, or make ravines smooth and navigable. It is commonly used to roughen the land causing huts to collapse or sink into the water. It is a lot more expensive to charge than Landbridge so it is not smart to use in any situation as the enemy can easily use a cheap landbridge to bridge the gap again. 

 

This spell is good to be cast on nearby water places, so you can drown land and buildings, or in really high hills or in a settlement on top of a hill - this means the huts will not sink but will get destroyed because the terrain beneath will shake and get distorted.

 

It's many times avaliable on online playing, but it's usually only charged in later stages of the game where the mana is abundant.

 

Damaged terrain (by lava or destructed buildings) can not be sink by erode or any other spell, and some objects like stone heads cant either.