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Olak
Despite his title of sentinel, he has the same stats of other goblin warrior, except for a higher AC because of his shield.
Involvement
Sentinel Olak will question any adventurers approaching his checkpoint and attack any of those he finds to be trespassing upon the Goblin Camp. He can be persuaded to let the party pass through several methods, including being a Drow (or appearing as one via Disguise Self), being vouched for by Sazza, using Illithid Persuasion, or convinced by using an Intimidation check.
Convincing him using a skill check other than the intimidation check, or failing any check will result in Olak asking you to smear Worg feces on your face to show your "war colours." The party may oblige and smear the dung on their faces, or fling it at his face to begin combat. A successful Athletics check will blind Olak before starting combat. Barbarians may pass a successful Intimidation check to force him to eat the dung instead and travel through peacefully.
Attacks and abilities