Originally Posted by
2D8HP
2D8HP is from the hit points that were rolled for a first level Ranger in 1970's Dungeons & Dragons.
...
All Rangers gain a special advantage when fighting against monsters
of the Giant Class (Kobolds - Giants). For each level they have gained
they add +1 to their damage die against these creatures, so a 1st Level
Ranger adds +1, a 2nd Level +2, and so on.