The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+97x^12+98x^13+326x^14+324x^15+771x^16+1256x^17+1880x^18+3808x^19+5118x^20+5420x^21+5088x^22+3768x^23+1918x^24+1320x^25+804x^26+288x^27+273x^28+98x^29+90x^30+4x^31+14x^32+4x^34

The gray image is a code over GF(2) with n=84, k=15 and d=24.
This code was found by Heurico 1.16 in 6.08 seconds.