The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+90x^8+22x^10+436x^12+220x^14+1184x^16+786x^18+2048x^19+1336x^20+20480x^21+1392x^22+2048x^23+814x^24+1114x^26+212x^28+492x^30+23x^32+62x^34+8x^38

The gray image is a code over GF(2) with n=84, k=15 and d=16.
This code was found by Heurico 1.16 in 2.53 seconds.