Clydas is present during the speech Lord CommanderJeor Mormont gave to the "graduating" recruits. After the speech is over and the recruits are assigned their orders, Clydas assists blind Maester Aemon walk towards the newly made stewards to give them their assignment.
In the A Song of Ice and Fire novels, Clydas is described as ugly: short, bald, chinless, hunched, with pink eyes and rounded shoulders. Jon Snow estimates him to be about 60-years-old. A few white hairs still cling to his scalp. Alongside Chett he tends to Aemon's needs and the ravens of Castle Black. When Samwell Tarly replaces Chett, Clydas remains assisting the blind maester.