  Using images taken with the Dark Energy Camera (DECam), the first extensive
survey of low mass and substellar objects is made in the 15-20 Myr Upper
Centaurus Lupus (UCL) and Lower Centaurus Crux (LCC) subgroups of the Scorpius
Centaurus OB Association (Sco-Cen). Due to the size of our dataset (>2Tb) we
developed an extensive open source set of python libraries to reduce our
images, including astrometry, coaddition, and PSF photometry. Our survey
consists of 29$\times$3 deg$^2$ fields in the UCL and LCC subgroups of Sco-Cen
and the creation of a catalog with over 11 million point sources. We create a
prioritized list of candidate for members in UCL and LCC, with 118 \emph{best}
and another 348 \emph{good} candidates. We show that the luminosity and mass
functions of our low mass and substellar candidates are consistent with
measurements for the younger Upper Scorpius subgroup and estimates of a
universal IMF, with spectral types ranging from M1 down to L1.
