New (rakshasa) unique: Mara, Lord of Ilusions.

This re-uses several ideas from the Emerald Eye FR, and implements the
spell "Mislead": this grants the "Misled" status effect to the player,
and causes on-level monsters to appear (glyph, name and tile) to be
other monsters. Only their appearance is changed.

Healing potions and rain remove this status effect.

Mara also has a beefed-up version of the Rakshasa clone spell: it
instead creates an "exact" clone (slightly altered spells list, and
non-unique status for his clones). Only two will ever be created at
once.

Finally, he has the spell "Summon Player Ghost". This spell creates a
ghost of the player (though marked as a summon, meaning that it
(shouldn't) register a milestone, though it will be treated as a
self-ghost kill) that is hostile. Only one of these should be existant
at any one point in time.

I'm pretty sure that I haven't broken anything, but would definitely
appreciate someone sanity-checking this commit.

Known minor issue: Kirke's summon ugly things being cast while having
the Misled status causes them to show up with no glyph.

3 files changed, 84 insertions, 0 deletions

diff --git a/crawl-ref/source/dat/database/monspeak.txt b/crawl-ref/source/dat/database/monspeak.txt
index 1b63fbcbcd..a9380051ec 100644
--- a/crawl-ref/source/dat/database/monspeak.txt
+++ b/crawl-ref/source/dat/database/monspeak.txt
@@ -2552,6 +2552,56 @@ Louise
 @_mercenary_guard_@
 ### END Louise
 %%%%
+############ MARA ### A powerful demon lord, Lord of Illusions
+Mara
+
+@_Mara_common_@
+
+w:5
+
+@_Mara_rare_@
+%%%%
+_Mara_common_
+
+VISUAL:@The_monster@'s face changes twice.
+
+@The_monster@ says, "I mislead the hearts of men!"
+
+@The_monster@ says, "What good are steel and magic against my illusions?"
+
+# Buddhism
+@The_monster@ says, "Entranced by some poetic flight, are you?"
+
+@The_monster@ says, "Bound art thou by all the snares!"
+
+# And original
+@The_monster@ growls.
+
+VISUAL SPELL:@The_monster@ gestures.
+
+VISUAL SPELL:@The_monster@ points ostentatiously.
+
+SPELL:@The_monster@ weaves an illusion.
+%%%%
+_Mara_rare_
+
+# Lord of Light
+@The_monster@ screams, "Tenfold be your damnation!"
+
+@The_monster@'s features momentarily become yours. "Wouldst slay thyself?"
+
+@The_monster@ says, "I stand as high above you as a star above the ocean's bottom."
+
+@The_monster@ smirks. "I am one who seeks the Path and the Right."
+
+@The_monster@ says, "Thou art lean, ill-favoured, death is in thy neighbourhood!"
+
+@The_monster@ says, "Difficult is the way of exertion, difficult to pass, difficult to enter upon."
+
+@The_monster@ calls, "Stop! In seven days from now the wheel of empire will appear!"
+
+@The_monster@ boasts, "I am lord over the four continents and the two thousand adjacent isles."
+%%%%
 ############ MARGERY ### A powerful sorceress, guarding the ORB
 Margery
 
diff --git a/crawl-ref/source/dat/database/monspell.txt b/crawl-ref/source/dat/database/monspell.txt
index 0ce22a12e5..c1556fcc50 100644
--- a/crawl-ref/source/dat/database/monspell.txt
+++ b/crawl-ref/source/dat/database/monspell.txt
@@ -85,6 +85,30 @@ Greater Healing cast
 
 @The_monster@ briefly glows brightly.
 %%%%
+Mislead cast
+
+@The_monster@ weaves an illusion.
+
+@The_monster@ misleads you.
+
+@The_monster@ clouds your mind.
+%%%%
+unseen Mislead cast
+
+Something tries to mislead you!
+
+Something weaves an illusion around you!
+%%%%
+Mara Summon cast
+
+@The_monster@ weaves an illusion.
+
+@The_monster@ shimmers.
+%%%%
+unseen Mara summon cast
+
+Something weaves an illusion!
+%%%%
 Symbol of Torment cast
 
 @The_monster@ calls on the powers of Hell!
diff --git a/crawl-ref/source/dat/database/quotes.txt b/crawl-ref/source/dat/database/quotes.txt
index 436eb7ab71..0f0e8d5920 100644
--- a/crawl-ref/source/dat/database/quotes.txt
+++ b/crawl-ref/source/dat/database/quotes.txt
@@ -756,6 +756,16 @@ dreadful nostrils and making ring waves around him, which can reach many
 miles. Could one doubt that this is the Leviathan of Job?"
     -Jacob Wallenberg, "Min son på galejan", 1781.
 %%%%
+Mara
+
+"This night the Lord of Illusion passed among you, Mara, mighty among
+ dreamers, mighty for ill. He did come upon another who may work with the
+ stuff of dreams in a different way. He did meet with Dharma, who may expel
+ a dreamer from his dream. They did struggle, and the Lord Mara is no more.
+ Why did they struggle, deathgod against illusionist? You say their ways are
+ incomprehensible, being the ways of gods. This is not the answer."
+    -Roger Zelazny, "Lord of Light", 1967
+%%%%
 Menkaure
 
 "Ye men of Egypt, ye have heard your king!