Backup guardians consistently increase material level on all zones (hello...

Backup guardians consistently increase material level on all zones (hello never-dropping Crystal Heart).

game/modules/tome/data/zones/deep-bellow/zone.lua

@@ -30,7 +30,8 @@ return {
 	all_lited = true,
 	persistent = "zone",
 	ambient_music = "Straight Into Ambush.ogg",
-	max_material_level = 2,
+	min_material_level = function() return game.state:isAdvanced() and 3 or 1 end,
+	max_material_level = function() return game.state:isAdvanced() and 4 or 2 end,
 	generator =  {
 		map = {
 			class = "engine.generator.map.Cavern",

game/modules/tome/data/zones/reknor/zone.lua

@@ -29,8 +29,8 @@ return {
 --	all_lited = true,
 	persistent = "zone",
 	ambient_music = "To the Depths.ogg",
-	min_material_level = 3,
-	max_material_level = 4,
+	min_material_level = function() return game.state:isAdvanced() and 4 or 3 end,
+	max_material_level = function() return game.state:isAdvanced() and 5 or 4 end,
 	generator =  {
 		map = {
 			class = "engine.generator.map.TileSet",

game/modules/tome/data/zones/scintillating-caves/zone.lua

@@ -34,7 +34,8 @@ return {
 	all_lited = true,
 	persistent = "zone",
 	ambient_music = "Mystery.ogg",
-	max_material_level = 2,
+	min_material_level = function() return game.state:isAdvanced() and 3 or 1 end,
+	max_material_level = function() return game.state:isAdvanced() and 4 or 2 end,
 	generator =  {
 		map = {
 			class = "engine.generator.map.Roomer",