This is a follow up to the post above.
These findings seem to corroborate known MB potency bonuses based on elemental resistances (+0 observed for helices, and +0.15, +0.40, +0.85, +1.15, and +1.50 observed for other direct-damage spells).
There is no obvious trend. For example, one might expect chapuli to have higher resistance against Aero and Stone (only +0.40 bonus), but why would it have only a +0.85 bonus against Fire?
Acuex take a 1.5x damage increase from Fire and Blizzard (and damage is decreased by a factor of 0.75x for all other spells), but the MB bonus is +0.85 for Blizzard versus +1.5 for Fire.
And then for worms, only a +0.40 MB bonus would be expected for Stone, but why is there only a +0.85 MB bonus for darkness elemental magic? (In this case, SCH has access only to Impact; helices and Kaustra don't receive a MB bonus enhancement aside from # of skillchains.)
Metalcruncher worm observed INT
292 (level 124)
301 (level 125)
312 (level 126)
Code:
Normal MB Damage ratio MB bonus (1.35 + X)
Mandragora thunder 1740 5696 3.273563218 1.496576712
dINT > 100 blizzard 1720 5632 3.274418605 1.497320526
MAB 300 fire 1700 5568 3.275294118 1.498081841
MDMG 250 aero 1680 5504 3.276190476 1.498861284
MBD +15 water 1660 4196 2.527710843 0.848009429
stone 1640 4148 2.529268293 0.849363733
impact 5693 18656 3.277006851 1.499571174
helix 1953 3027 1.549923195 -0.0022407
Chapuli thunder 1740 5696 3.273563218 1.496576712
dINT > 100 blizzard 1720 5632 3.274418605 1.497320526
MAB 300 fire 1700 4300 2.529411765 0.849488491
MDMG 250 aero 1680 3380 2.011904762 0.399482402
MBD +15 water 1660 5436 3.274698795 1.49756417
stone 1640 3296 2.009756098 0.397613998
Uragnite thunder 435 1424 3.273563218 1.496576712
dINT > 100 blizzard 430 1236 2.874418605 1.149494439
MAB 300 fire 425 732 1.722352941 0.14769821
MDMG 250 aero 420 1207 2.873809524 1.148964803
MBD +15 water 415 715 1.722891566 0.148166579
stone 410 1178 2.873170732 1.148409332
Acuex thunder 1302 4200 3.225806452 1.455049088
dINT > 100 blizzard 2580 6522 2.527906977 0.84817998
MAB 300 fire 2550 8352 3.275294118 1.498081841
MDMG 250 aero 1260 4056 3.219047619 1.449171843
MBD +15 water 1242 1920 1.54589372 -0.005744591
stone 1230 1902 1.546341463 -0.005355249
Umbril thunder 1519 4900 3.225806452 1.455049088
dINT > 100 blizzard 1505 4844 3.218604651 1.448786653
MAB 300 fire 2975 9744 3.275294118 1.498081841
MDMG 250 aero 1470 4732 3.219047619 1.449171843
MBD +15 water 1449 4676 3.22705314 1.456133165
stone 2870 7259 2.529268293 0.849363733
Worm (lv126) thunder 1755 6900 3.931623932 1.499002849
dINT 16 blizzard 1695 6665 3.932153392 1.499386516
MAB 400 fire 1635 6420 3.926605505 1.495366308
MDMG 250 aero 1575 6185 3.926984127 1.495640672
MBD +38 water 1515 5950 3.927392739 1.495936768
stone* 1485 3595 2.420875421 0.404257551
impact 4634 13554 2.924902892 0.849175107
*Akademos