A Ketek is a complex form of a holy Vorin poem which reads the same forwards and backwards (allowing for alteration of verb forms), and is also divisible into five distinct smaller sections, each of which makes a complete thought.
The complete poem must form a sentence that is grammatically correct and (theoretically) poignant in meaning. Because of the difficulty in constructing a ketek, the structure was once considered the highest and most impressive form of all Vorin poetry. 
|“||Above silence, the illuminating storms—dying storms—illuminate the silence above.||”|
–An illiterate dying Herdazian 
|“||Alight, winds approach deadly approaching winds alight.||”|
|“||Radiant / of birthplace / the announcer comes / to come announce / the birthplace of Radiants.||”|
– Allahn