Gruzila is the bouncer at the brothel run by Mama Lantieri. He is considered "a true artist in his field". Dandelion mentions him to Rience.
“
Now listen, you scroundrel. Dandilion stood up and pretended to pull a threatening face. I loathe and despise violence and force, but I'm going to call Mama Lantieri in a minute and she will call a certain Gruzila who fulfills the honourable and responsible role of bouncer in this establishment. He is a true artist in his field. He'll kick your arse so hard you'll soar over the town roofs with such magnificence that the few people passing by at this hour will take you for a Pegasus.
”
— pg(s). 24, Blood of Elves (UK edition)