[1] Marsh also suggested a new character class, the mystic, that could teleport to various planes of existence via mental powers.

By adding a second axis, the number of possible alignments based on combinations of Law, Chaos, Good, Evil and Neutral grew from three to nine.

)[4] In 1977, most of Marsh's aquatic creature creations were converted to the new AD&D game system by Gary Gygax for use in the Monster Manual; in the preface Gygax credited Marsh "for devising the creatures for undersea encounters which originally appeared in BLACKMOOR, as I have radically altered them herein.

"[5] During the 1980 summer break, he worked at TSR, where he was lead writer on the 1981 version of Dungeons & Dragons Expert Set.

[10] A color cube illustrating how their planes would interface appeared in the May 1983 issue of Dragon.