5. First Level Magic User Spells (Ill 7). Illusionists were treated pretty pretty shabbily by Gygax, and the way you know that is that when an illusionist reached the apex of their power, when they could cast prismatic spray ... or alter reality ... they could also choose to cast the well known spell, FIRST LEVEL MAGIC USER SPELLS! That's right, you could choose between prismatic spray and, um, erase. Good times!
Heh. To this day I remember yelling at the DM for days after creating my gnome Fighter/Illusionist way back when, and found that he'd get 1st-level Magic-User spells at... 14th level. I mean, YTAL indeed.
But I suppose the phenomenon dates from that time when CHARACTER CLASS was the
Alpha et Omega of PC life. Wherefore any spell available to any character class--and with that I mean, um..., well, Magic-Users, originally--could only be available to other classes at a higher level. Thus, as we learn from Mr. Aronson's article in
The Wild Hunt #19, which has the added advantage of having been based on a class invented by him when was about 12 years old IIRC, Illusionists could cast
Detect Illusion at 1st level, and then
Detect Magic--
i.e., to detect Magic-User magic--at 2nd level. Whereas Magic-Users COULD NOT cast
Detect Illusion at all, and therefore NEVER know whether they were confronted with an illusion at all, amirite?
And yeah, Mr. Gygax was particularly cruel to the poor Illusionist when he included it in the PHB, which I suppose he actually did only coz Mr. Aronson's Illusionist did have use of quite a number of quite inventive spells--and even more of them than would eventually appear in the PHB.
Which also lies at the basis of the 1st-level MU spells. For in
The Strategic Review Vol. 1, No. 4 (1975, mind u), the Illusionist would get them at 8th level, as 4th-level spells. And then, crucially, at 9th level, he could cast 2nd-level Magic-User spells! And then, um.... --eagerly turns to
The Dragon #1 and even
The Wild Hunt--wait, what? No 3rd-level spells at 11th level?
Oh well.
(...) or tell me how wrong I am and how you used Erase to take down a band of fire giants in the comments!
Heh, that's pushing it,
mon cher! I mean, it's ONLY a 1st-level spell.
However.
As I recall, our party once found themselves, and I paraphrase: "... leaving the safe cave and traversing a ravine that led directly to the spiney, broken heap of slag which was indicated as the site of the Hall by their map--and obvious to them otherwise, for it had a wide, well-trod path leading up to two great slabs of black stone, obsidian portals which gave access to Snurre's Hall, and were completely covered in all manner of symbols, runes, and glyphs, some of them glowing evilly" ... wait, that's not in the module!
Oh dear, the DM may have upped the ante a bit as he colored the whole and brought it to life while considerable detail had already been given.