+10% Bonus Mythstones

[Keldi]

Upgrading a kingdom to level 16 gives +10% Bonus Mythstones.

Is this bonus only for the upgraded kingdom or global (stackable)?
What happens when the kingdom gets the temporary +20% Mythstone Bonus? Will the bonus be 20%+10% or only 20%?

Thanks in advance for answers.

[xolid99]

Only for the kingdom and yes it stacks with 20%. I have had 95 Mythstones a few times.

[Andruwjones]

It stacks for that kingdom…