balance this out since it is the only vault in its depth range, and will be picked all the time if the roll for a vault comes up (1 in 9).
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@996 c06c8d41-db1a-0410-9941-cceddc491573
WX535AVP7MD2BYA3NAU3VPV7QN6JOCE4JHDRMXKYNRIW7V2UOHJAC
# Entry vaults, random vaults and minivaults; special levels (including V:8!)
# should go to splev.des. Do NOT put special levels here, or they could be
# selected when the game looks for random vaults.
# Random vaults, minivaults and canonical entry vaults go here; asciiart
# entry vaults go in asciiart.des and "edgy" entry vaults go in tricky.des.
# Special levels (including V:8!) should go to splev.des. Do NOT put special
# levels here, or they could be selected when the game seeks random vaults.