More choices bring with much fun, balance of the different choice income. Layer 2 unlock 4, Layer 2 unlock 8, and the talent trees A and B are separated. Level 9 heroes, first unlock a tree Layer 2, the remaining choice continue to unlock the layer 3, or select another Tier 1 talent tree skills. I said, unlock points it takes too much, why not reduce it? Layer 2 unlock 3，Layer 3 unlock 6. So you will be able to choose among the four heroes AB talent tree Layer 2 skills 4. There is also a problem, why must have a talent tree? It is a good game design. But NOTD talent tree is one of only 5 skill tree, even lower than the grass tree ... Too simple talent tree is difficult to bring the players to think about the fun of build, and build attempt. Could each hero's talent trees A and B merge? Layer 1 skills 4 to select, Layer 2 skills 4, Layer 1 skills 2. This model change few, but the choice of the players as much a lot. 2 Tier 3 may need some restrictions but the impact is not large. 1 although very powerful but not enough magic consumption. 2 Some skills among a bonus, the Tier 3 is not necessarily the best. After the opening up of the talent tree, Rifleman not select this talent Improved Focus Fire, the role of this talent is too low. This is the genius of the design is unbalanced, unlock the talent tree to balance this issue is unreasonable.