git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2942 c06c8d41-db1a-0410-9941-cceddc491573
AGFYW7AYBL6G4MGD3VOV7PZYJBN5Z3CETCDLKYNXKSCVODKLXIRAC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
// since darts/rocks are missiles, they only use inv_plus
// missiles only use inv_plus