I've found numbers for Tier 1 and Tier 3

"Holy (12d6)
Makes the weapon good. Deals 12d6 Good damage on hit.

Acid Burst
Deals Burst Acid damage on critical hits, increasing with higher critical multipliers on the weapon.

Good Blast on Vorpal (10d120)"

But no numbers on the acid burst.
surely it can't be the heroic greensteel version

"This weapon is sheathed in corrosive acid. The weapon deals an extra 1 to 6 acid damage each hit. In addition, critical hits deal an additional 1 to 10 acid damage for weapons with a x2 critical multiplier, 2 to 20 for a x3 critical multiplier and 3 to 30 for a x4 multiplier."

Any idea what the legendary numbers are?