Grants a bonus determined by the the current form the druid is in.
Bear - 2/4% physical damage increase
Cat - 2/4% critical strike increase
Moonkin - 2/4% spell damage increase
Tree of Life - 2/4% healing increase
Master Shapeshifter is a talent in the restoration tree. You will need to spend 10 points in the restoration to get to it and Natural Shapeshifter must be maxed at 3/3. Master Shapeshifter requires 2 points to max out. The ability increases a certain stat by 2% per point. The stat is determined by the current form the druid is in.
Bear form receives an increase to physical damage done, helping to maintain threat on a target