From PathfinderWiki

Thornward is an horrific hedge maze infested with assassin vines in the town of Maashinelle, in the River Kingdom of Lambreth. Master Gardener Cenestin Maesner is responsible for cultivating Lambreth's river blackberries into Thornward. The ruler of the kingdom, Lord Kamdyn Arnefax uses Thornward for impressive executions.1

Repeated assassination attempts against Lord Arnefax have ended in public torture and execution with thornvines grown through the victims and crafted into cruel topiary.1