Mob statistics rework

The idea behind this is to rework the Mobs statistics and Mob levels allowing to choose between paths for specific bonuses.

Also, this rework could work to make a nerf or make the current system less OP

Basically the idea is to have a passive skill per mob. Lets say you wanna focus on Demons, then you have a passive skill tree that works only for Demons (like the current system basically)

The passive screen could be similar to this:

1) Passives you can choose, different passives will be unlocked at certain levels (like its indicated in number 4 bar). Square passives means the "basic" bonus meanwhile the circle ones are small modifications to it. A great example here would be:
  

            1_ 10% less phys dmg received

            2_ Dmg reduction also applys to magic dmg

            3_ 5% additional dmg reduction

            4_ 3% aditional dmg reduction

2) Basically kill count (as we have now)

3) 2 Options here:

     - Mastery level (current level of mob)

     - Every time we get a mastery level, we get mastery points (could be 1-2-3...depends on buff / nerf decisions)

4) Depends on the previous options:

     - Just show Mastery level progression

     - Shows the amount of points invested on the Mastery to unlock more Passives.

Also, the Mastery level (the bottom bar) could give some kind of bonus. This image is from the original game:

Bonuses here could be small additions like:

• +5 hitting
• +1% drop rate
• +1% crush chance (only apply on demon)
• +1% crush dmg
• and more..

What you guys think?