You should notice that many of the answers have uncommon letters. Each of the starred columns is meant to contain 25 different letters of the alphabet, and the missing ones spell the answer.
TWELVEGOP URDUNAVEL ROWLFSKIS INVIOLATE AGARBARQS EXTOLAQUA OKJOURNAL ABBAQUICK ITCHKICKS OFFEXEMPT DMZSPAWNS ALONZOJVC RHYTHMTWA EZRASOPHS OVIDJESSE MEXICOYYZ BJSURHOFF ASHAMEDJO NIKAGOLGI GYPSYAFRO EQUITABLE SPLEENXXX PAQUINHMS EDGEARUBA ACMEDIZZY UN W ED
The answer is UNWED