The generator matrix

 1  0  0  0  0  1  1  1  1  4  1  4  2  1  2  1  1  2  2  4  1
 0  1  0  0  0  4  1  3  5  1  2  1  1  5  1  3  3  2  4  4  0
 0  0  1  0  0  7  3  2  6  7  1  5  4  5  3  4  3  0  1  1  0
 0  0  0  1  0  1  2  5  4  3  7  5  5  2  0  4  1  1  3  3  2
 0  0  0  0  1  1  4  4  5  5  4  2  1  5  3  6  7  3  2  1  6

generates a code of length 21 over Z8 who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+174x^15+571x^16+1512x^17+2445x^18+3578x^19+5006x^20+5732x^21+5543x^22+3874x^23+2270x^24+1312x^25+491x^26+182x^27+54x^28+20x^29+1x^30+2x^32

The gray image is a code over GF(2) with n=84, k=15 and d=30.
This code was found by Heurico 1.16 in 6.45 seconds.