Alexander Augunas wrote:
Standard Greatsword — 2d6
Large Greatsword (Titan Fighter w/ Giant Weapon Wielder — 2d8
+ Enlarged via Enlarge Person — 3d6
+ Impact Weapon or Lead Blades Spell — 3d8
Your damage progression is incorrect. Per the link in your post...
"If the size increases by one step, look up the original damage on the chart and increase the damage by
two steps." (emphasis mine)
So the progression would actually be...
Standard Greatsword — 2d6
Large Greatsword (Titan Fighter w/ Giant Weapon Wielder) — 3d6
+ Enlarged via Enlarge Person — 4d6
+ Impact Weapon or Lead Blades Spell — 6d6