The generator matrix

 1  0  1  1  1  6  1  1  0  1  1  6  1  1  1  1  1  1  2  2  2
 0  1  3  6  1  1  0  3  1  6  5  1  0  4  6  2  3  5  0  2  2
 0  0  4  0  0  4  4  0  0  4  4  4  0  4  0  4  0  0  4  0  0
 0  0  0  4  0  4  4  4  4  0  4  0  4  0  0  4  0  0  4  4  4
 0  0  0  0  4  4  4  4  0  4  0  4  0  4  4  0  4  0  0  0  4

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

Homogenous weight enumerator: w(x)=1x^0+91x^18+32x^19+117x^20+64x^21+84x^22+32x^23+71x^24+16x^26+3x^28+1x^34

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 0.0119 seconds.