:edit: Looks like 'none of the above' unless you have access to Powerful Attribute as you cannot bump above 1d12+2 without it.
The Rune bump seems to be included for completeness when used by Threats.
pg170 wrote:
Die Bump: Some spells or Talents may provide you with a Die Bump. Die Bumps can be conceivably applied to any die roll in the game, and unless otherwise noted are capped
at d12. Thus, if you use a Talent that grants a Die Bump to Insight when using a particular skill you simply use the next highest die. If the die is already a d12, you instead gain a +2 bonus to the affected die roll.
Quote:
Enlarged Hands: Your hands are abnormally large and powerful, making any fine manipulation difficult to say the least. Any time you attack with your bare hands, you gain a Die Bump to your Might (maximum of d12+2), but you suffer a Die Penalty to any Quickness Action
Skill Rolls that depend on using your hands.
Quote:
Might Rune:
... Unlike a standard Die Bump, if you possess d12 Might, your Might increases to 2d6 instead. ...
Special: If this Rune is used in combination with any spell or Talent which grants a Might Die Bump, the effects do stack to a maximum potential of 2d8.