| Issue | #21 |
| Published | November 1986 |
| Cover Price | 0.75 |
| Pages | 36 |
| Editing | Archie Goodwin; Jo Duffy (associate) |
| Pencils | Sergio Aragones |
| Inks | Sergio Aragones |
| Colors | Tom Luth |
| Reprinted | in Groo Festival, The (Marvel, 1993 series) #[nn] |
| Characters | Arba & Dakarba; Grativo |
| Synopsis | Groo gets involved with warring magicians |
| Script | Sergio Aragones (co-plot); Mark Evanier (co-plot & dialogue) |
| Pencils | Sergio Aragones |
| Inks | Sergio Aragones |
| Colors | Tom Luth |
| Letters | Stan Sakai |
| Notes | Division of writing credit from Mark Evanier via the GCD Errors list, September 2009. |
| Reprinted | in Groo Festival, The (Marvel, 1993 series) #[nn] |