New Uber invaders were introduced in 2017 where the lairs are much faster than level 6. When you fight invaders upon defeat of invaders then you are rewarded with invader lairs where you can farm them for resources and materials as gifts. Level 1 has least amount of resources and is the slowest, whereas, level 6 has more and fastest.
There are 6 levels of resource locations. When you are farming resources in the resource kingdom locations it helps to know that each has different speeds. Collecting these materials helps you build hero gear that enhances your power and capabilities. Some you can get from resource locations within the Vikings kingdoms, also from doing tasks you are given not only hero experience points and resources but also gifts of material, you also obtain them from fighting invaders, from resource coffins in the clan store or those you can buy with gold.
The following information will help you figure out what materials there are and where and how to get them, keep in mind that you can obtain materials in different ways.