So back in 2005 I attempted to find the formula for calculating Elemental Breaths because loldrg and there was no previous testing done at that time. The value I derived back then was Floor(Current HP * 0.182) which equated to a 180 breath at 991 HP. With Wyrm Armet, I'd have a 210 damage breath so the modified formula for breath became floor(Current HP * 0.212) which added up again nicely to the expected damage.
Fast forward to a few weeks ago with the addition of AF2+2 augments. Messing around on the test server, the formula above did not coincide with the actual damage observed, the observed value was far lower than the expected damage. Noting Yugl's tests finding that BLU Breaths are not decimals but Fractions I feel like Wyvern Breaths are fraction based as well but the fraction for 0.182 is something like 91/500 which seems too far out there. My second hypothesis is that the original formula is lacking and is probably a bit more complex than I thought. Back then I thought it was simply a percentage of the Current HP but it may in fact be a more complicated formula something along the lines of:
floor(Current Wyvern HP * [Insert Decimal] + level or some kind of integer)/x
Or something along those lines.
Any mathologists have any insight?