This is the first in a series I am calling The Grand Grid. Each involves a logic grid puzzle that is solved by gathering clues presented in variously obscured forms. The description of the grid puzzle itself is part of the puzzle. The text forms may be Scytale, Caesar, Keyed Caesar, or Vigenère.
OFCTYR ESP ESTCO LRP QZFC XZFYELTYD ZQ DNZEWLYO HPCP ESZFDLYOD ZQ XPEPCD ELWWPC ESLY ESPJ LCP EZOLJ ESPJ HPCP LWDZ TY L DZXPHSLE OTQQPCPYE WZNLETZY ESPTC YLXPD LCP MPY YPGTD MPY WZXZYO MPY WLHPCD LYO NLTCY RZCX ESPTC SPTRSED LCP DPGPY ESZFDLYO EHZ SFYOCPO EPY LYO DPGPY ESZFDLYO ESCPP SFYOCPO QZCEJ LYO DPGPY ESZFDLYO QZFC SFYOCPO DPGPYEJ LYO DPGPY ESZFDLYO DTI SFYOCPO ESPTC WZNLETZYD LCP RZYOZC CZSLY XZCOZC LYO PCTLOZC ESP XZFYELTY TY RZYOZC TD ZYP SFYOCPO LYO ESTCEJ XPEPCD ELWWPC ESLY MPY YPGTD BLOEENNRDNTUEHEVAIINUSBHIEPSNJTLZAOBLMO HKT RGCKXY OY KOZNKX ZNK SUATZGOT OT XUNGT UX ZNK SUATZGOT ZNGZ OY YKBKT ZNUAYGTJ GTJ ZCU NATJXKJ GTJ ZKT SKZKXY ZGRR
The script as a substitution cipher for those who want to tackle it with frequency analysis rather than looking for it online:
Hint: "BLO..." is based on the Scytale.