Kill a shadow mist in Shadow Castle until you loot an ivory ring of temperance then head to Towne of Rune and locate Kanis he is normally inside the Laughing Fey on Main Street, give him the ring to receive either QP or PP rewards.
At level 170:
You give an ivory ring of temperance to Kanis. 'Thank you brave Sanger.' Kanis says. 'The guild of assassins will not forget your kindness.'
You gain 2 practices!
Same reward at level 240.