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How many times per day Cleric can use "Wall of Ashes (Su)" ability from Ash subdomain

"You can use this ability for a number of minutes per day equal to your cleric level, but these minutes do not need to be consecutive."
But how many walls per day i can create? Is it dismissal?

Can anyone please explain me "cruel thicket" subdomain power from Thorns (plants)? How does it works, particularly this moment:
"if you activate this ability in an area with numerous plants (grass, weeds, trees, etc.), the area also becomes difficult terrain"
Which area means? Nine squares around you or all area with grass,trees such as meadow or forest? If it's only 9 squares, so - how does it works, i mean - creature must move with half half speed?

"These effects last for 1 minute, after which the vines crumble to dust. Creatures able to move through natural undergrowth unhindered ignore the effects of this ability"
And this? What undergrowth means?