Prerequisite: Mountain Dwarf, 13 Strength or Dexterity
The grudge fuelled anger of the Mountain Dwarves knows no bounds. You have 3 Grudge points to spend on Fury, which lasts for 1 turn. When declaring an attack, you can spend 1 Grudge point to enter into Fury. When you enter Fury, you get a number of additional weapon attacks equal to your proficiency bonus, minimum 2.
You recover d3 Grudge points on a short or long rest. Alternatively, you regain 1 Grudge point if you kill a creature whilst Fury is active.