New lich sounds (also used them for death knight).

data/campaigns/The_South_Guard/units/Demilich.cfg

@@ -18,8 +18,8 @@
 	cost=60
 	usage=fighter
 	unit_description= _ "After too much time dabbling with forbidden magics and dark arts, these magi have begun to pay a heavy price. Demiliches have started losing their bodies, becoming undead themselves. With time, they may become fully undead, and feared by all alike."
-	get_hit_sound=skeleton-hit.wav
-	die_sound=wail-long.wav
+	get_hit_sound={SOUND_LIST:LICH_HIT}
+	die_sound=lich-die.ogg
 	[attack]
 		name=touch
 		icon=attacks/touch-undead.png

data/campaigns/Under_the_Burning_Suns/units/Spider_Lich.cfg

@@ -21,8 +21,8 @@
 	cost=62
 	usage=fighter
 	unit_description= _ "No one is quite sure how spider liches are created, but they are horrific sight to behold. Crawling around on huge skeletal legs, and wielding huge magical staves, these abominations are fearsome undead foes. "
-	get_hit_sound=skeleton-hit.wav
-	die_sound=wail-long.wav
+	get_hit_sound={SOUND_LIST:LICH_HIT}
+	die_sound=lich-die.ogg
 	[attack]
 		name=touch
 		type=cold

data/sound-utils.cfg

@@ -62,6 +62,9 @@ human-die-1.ogg,human-die-2.ogg,human-die-3.ogg #enddef
 #define SOUND_LIST:HUMAN_FEMALE_DIE
 human-female-die-1.ogg,human-female-die-2.ogg,human-female-die-3.ogg #enddef
 
+#define SOUND_LIST:LICH_HIT
+lich-hit-1.ogg,lich-hit-2.ogg #enddef
+
 #define SOUND_LIST:NAGA_HIT
 naga-hit-1.ogg,naga-hit-2.ogg,naga-hit-3.ogg #enddef
 

data/units/Undead_Necro_Ancient_Lich.cfg

@@ -19,8 +19,8 @@
 	unit_description= _ "A being of this order is a herald of the age long past. Anyone who encounters an Ancient Lich likely has far worse things to worry about than death.
 
 Special Notes:"+{SPECIAL_NOTES_MAGICAL}+{SPECIAL_NOTES_DRAIN}
-	get_hit_sound=skeleton-hit.wav
-	die_sound=wail-long.wav
+	get_hit_sound={SOUND_LIST:LICH_HIT}
+	die_sound=lich-die.ogg
 	[defend]
 		[frame]
 			begin=-150

data/units/Undead_Necro_Lich.cfg

@@ -18,8 +18,8 @@
 It is not known, save perhaps by the inner circles of necromancy, whether life is prolonged indefinitely or simply extended. But to even consider such a thing bears tribute to the magnitude of what they have already achieved.
 
 Special Notes:"+{SPECIAL_NOTES_MAGICAL}+{SPECIAL_NOTES_DRAIN}
-	get_hit_sound=skeleton-hit.wav
-	die_sound=wail-long.wav
+	get_hit_sound={SOUND_LIST:LICH_HIT}
+	die_sound=lich-die.ogg
 	[defend]
 		[frame]
 			begin=-150

data/units/Undead_Skele_Death_Knight.cfg

@@ -24,8 +24,8 @@
 	unit_description= _ "Tales are told of the mightiest warriors and generals, who, cursed with hate and a sense of betrayal, came back to this world as Death Knights. Wielding the same weapons as they did before, they command the Undead in their quest for revenge.
 
 Special Notes:"+{SPECIAL_NOTES_LEADERSHIP}
-	get_hit_sound=skeleton-big-hit.ogg
-	die_sound=skeleton-big-die.ogg
+	get_hit_sound={SOUND_LIST:LICH_HIT}
+	die_sound=lich-die.ogg
 	[abilities]
 		{ABILITY_LEADERSHIP_LEVEL_3}
 	[/abilities]