A previous post likened several of the Defenders to characters (or monsters) from Dungeons & Dragons.
The D&D ad that ran in Defenders #98 accentuated the similarities between the fantasy role-playing game and the superhero comic book.
The comic-strip style ad that month depicted a party of adventurers encounter a Shambling Mound, a semi-intelligent creature composed of vegetation.
Coincidentally, in that very issue, the Defenders met Man-Thing, a semi-intelligent creature composed of vegetation.
In the ad, Grimslade the magic-user cast a charm spell to stop the monstrous Shambling Mound.
In the Defenders story, Dr. Strange entered into his astral form to face the demons that had gained control of the typically timid Man-Thing.