Creeper's Attack Potency?

Building level (Can destroy about 15 m^3 of rock) Large Building level when charged by lightning (Can destroy 33 m^3 of rock)

How is that a building level feat?

Regular:

(Fragmentation) 15000000*8=1.2*10^8 jouls=28.68 kg - Small Building level

(Voilent Fragmentation) 15000000*69=1.035*10^9 jouls=247.37 kg - Small Building level+ (1.055% below 8-C baseline)

Charged:

(Fragmentation) 33000000*8=2.64*10^8 jouls=63.10 kg - Small Building level

(Voilent Fragmentation) 33000000*69=2.277*10^9 jouls=544.32 kg - Building level

I think fragmentation is more consistent since the explosion leaves cobblestone as drop

Welp, the math seems good, but can't determinate if they used pulv, haven't played the game so don't known.

The numbers on the wiki are inexact. A base Creeper destroys about 92 blocks of dirt with a single explosion and 20 blocks of stone with the same explosion. Although the main reasoning for the Creeper's AP is now scaling to other base monsters, who have 8-C durability. So that should be edited. The Charged Creeper is far stronger than the base Creeper (who can one-shot 8-Cs), so it should obviously scale to 8-C.

Also, Stone dropping as Cobblestone implies that stone was reduced to pebbles, which would be Violent Fragmentation. On top of that, only 1/3rd (1/6th for a Charged Creeper) of the blocks are dropped, with the rest being completely gone. This implies that 2/3rd (5/6th) of the result is at least Pulverization.

Given that it should certainly be violent frag and given that it's 20 blocks rather than 15, the explosion of a base Creeper should be 8-C either way.