The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  2  1  1  0  1  4  1  2  1  2
 0  2  0  0  4  6  6  2  4  2  2  6  6  2  0  4  2  4  0  2  2
 0  0  2  0  6  6  2  0  2  2  4  4  6  6  2  2  6  4  2  2  6
 0  0  0  2  2  4  2  6  0  0  6  4  6  0  4  6  4  0  6  6  6

generates a code of length 21 over Z8 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+86x^18+32x^19+135x^20+64x^21+82x^22+32x^23+52x^24+14x^26+11x^28+2x^30+1x^32

The gray image is a code over GF(2) with n=84, k=9 and d=36.
This code was found by Heurico 1.16 in 8.28 seconds.