The instrument combines high resolution or high speed thermal powder diffraction with Small-Angle Neutron Scattering (SANS) and imaging. The full-scope instrument uniquely features a cold and a thermal guide for fulfilling the diverse requirements for diffraction and SANS. With an instrument length of 158 m from source to sample, HEIMDAL will take advantage of the high neutron flux of the long pulse at ESS, whilst maintaining a high q-resolution due to the long flight path. The powder diffractometer has a q-range coverage of up to 25 Å-1 allowing pair distribution function (PDF) analysis of total scattering data. With the addition of SANS with a 10 m long collimation section and matching distance from sample to detector, HEIMDAL will be able to cover a uniquely broad length scale within a single instrumental set-up.