diff --git a/game/modules/tome/data/maps/vaults/auto/greater/greater-checkerboard.lua b/game/modules/tome/data/maps/vaults/auto/greater/greater-checkerboard.lua
index 4a580ddb37052311bf5440e09b7bb347c2e0fcc4..476db3b9dde708f4903fa947693f451f6d6b313a 100644
--- a/game/modules/tome/data/maps/vaults/auto/greater/greater-checkerboard.lua
+++ b/game/modules/tome/data/maps/vaults/auto/greater/greater-checkerboard.lua
@@ -28,28 +28,25 @@ specialList("actor", {
 border = 0
 defineTile('.', "FLOOR")
 defineTile('#', "DOOR")
+defineTile('!', "DOOR_VAULT")
 defineTile('X', "HARDWALL")
 defineTile('8', "FLOOR", {random_filter={add_levels=15, tome_mod="gvault"}}, {random_filter={add_levels=50}})
 defineTile('!', "DOOR_VAULT")
 
+defineTile('7', "FLOOR", {random_filter={add_levels=15, tome_mod="uvault"}}, {random_filter={add_levels=15, random_boss={name_scheme=_t"#rng# the Guardian", nb_classes=3, loot_unique=true, ai_move="move_complex", rank=4}}})
+
 rotates = {"default", "90", "180", "270", "flipx", "flipy"}
 
 return {
-[[.......................................]],
-[[.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.]],
-[[.!8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8X.]],
-[[.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX#X.]],
-[[.X8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8X.X.]],
-[[.X#XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX#X#X.]],
-[[.X8X8#8#8#8#8#8#8#8#8#8#8#8#8#8#8X8X.X.]],
-[[.X#X#XXXXXXXXXXXXXXXXXXXXXXXXXXX#X#X#X.]],
-[[.X8X8X8#8#8#8#8#8#8#8#8#8#8#8#8#8X8X.X.]],
-[[.X#X#X#XXXXXXXXXXXXXXXXXXXXXXXXXXX#X#X.]],
-[[.X8X8X8#8#8#8#8#8#8#8#8#8#8#8#8#8#8X.X.]],
-[[.X#X#XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX#X.]],
-[[.X8X8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#.X.]],
-[[.X#XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.]],
-[[.X8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8#8!.]],
-[[.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.]],
-[[.......................................]],
+[[...........................]],
+[[.XXXXXXXXXXXXXXXXXXXXXXXXX.]],
+[[.!8#8#8#8#8#8#8#8#8#8#8#8X.]],
+[[.XXXXXXXXXXXXXXXXXXXXXXX#X.]],
+[[.X8#8#8#8#8#8#8#8#8#8#8X.X.]],
+[[.X#XXXXXXXXXXXXXXXXXXXXX#X.]],
+[[.X8X7#8#8#8#8#8#8#8#8#8#.X.]],
+[[.X#XXXXXXXXXXXXXXXXXXXXXXX.]],
+[[.X8#8#8#8#8#8#8#8#8#8#8#8!.]],
+[[.XXXXXXXXXXXXXXXXXXXXXXXXX.]],
+[[...........................]],
 }
\ No newline at end of file