and the king entreated him to journey no more into the dark and unknown realms , but beren said : `` no need is there thereof , for behold that jewel is even now nigh to thy caverns , '' and he made clear to tinwelint that that beast that ravaged his land was none other than karkaras , the wolfward of melko 's gates -- and this was not known to all , but beren knew it taught by huan , whose cunning in the reading of track and slot was greatest among all the hounds , and therein are none of them unskilled .