diff --git a/src/tiles.lua b/src/tiles.lua
index 9a5fa42..aa8cb2d 100644
--- a/src/tiles.lua
+++ b/src/tiles.lua
@@ -14,6 +14,14 @@ Tiles.DOOR_LOCKED = "x"
 Tiles.TRAP = "^"
 Tiles.WATER = "~"
 Tiles.RUBBLE = ":"
+Tiles.LAVA = "%"
+Tiles.CHASM = "V"
+Tiles.ICE = "-"
+Tiles.LEVER = "H"
+Tiles.LEVER_PULLED = "I"
+Tiles.VAULT_DOOR = "K"
+Tiles.GATE_CLOSED = "8"
+Tiles.GATE_OPEN = "9"
 
 local props = {
   [Tiles.WALL]        = { walkable = false, blocksSight = true,  door = false },
@@ -26,6 +34,14 @@ local props = {
   [Tiles.TRAP]        = { walkable = true,  blocksSight = false, door = false },
   [Tiles.WATER]       = { walkable = true,  blocksSight = false, door = false },
   [Tiles.RUBBLE]      = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.LAVA]        = { walkable = true,  blocksSight = false, door = false, lava = true },
+  [Tiles.CHASM]       = { walkable = true,  blocksSight = false, door = false, chasm = true },
+  [Tiles.ICE]         = { walkable = true,  blocksSight = false, door = false, ice = true },
+  [Tiles.LEVER]        = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.LEVER_PULLED] = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.VAULT_DOOR]   = { walkable = false, blocksSight = true,  door = false, vault = true },
+  [Tiles.GATE_CLOSED]  = { walkable = false, blocksSight = true,  door = false, gate = true },
+  [Tiles.GATE_OPEN]    = { walkable = true,  blocksSight = false, door = false, gate = true },
 }
 
 local wallProps = props[Tiles.WALL]
@@ -50,4 +66,24 @@ function Tiles.isClosedDoor(glyph)
   return glyph == Tiles.DOOR_CLOSED or glyph == Tiles.DOOR_LOCKED
 end
 
+function Tiles.isLava(glyph)
+  return Tiles.of(glyph).lava == true
+end
+
+function Tiles.isChasm(glyph)
+  return Tiles.of(glyph).chasm == true
+end
+
+function Tiles.isIce(glyph)
+  return Tiles.of(glyph).ice == true
+end
+
+function Tiles.isVaultDoor(glyph)
+  return Tiles.of(glyph).vault == true
+end
+
+function Tiles.isGate(glyph)
+  return Tiles.of(glyph).gate == true
+end
+
 return Tiles
diff --git a/src/titles.lua b/src/titles.lua
new file mode 100644
index 0000000..2f9324d
--- /dev/null
+++ b/src/titles.lua
@@ -0,0 +1,37 @@
+-- Renown-gated titles: a flavor rank meta.lua's own banked renown climbs
+-- through, one tier per crossed threshold, entirely separate from a
+-- character's class - a title describes how far this save file's whole
+-- history has come, not what any single run's build looked like.
+
+local Titles = {}
+
+Titles.LADDER = {
+  { threshold = 0, name = "Whelp" },
+  { threshold = 50, name = "Delver" },
+  { threshold = 150, name = "Warden" },
+  { threshold = 350, name = "Vanquisher" },
+  { threshold = 700, name = "Warren Lord" },
+  { threshold = 1500, name = "Undying" },
+}
+
+-- The highest title whose threshold `renown` clears, walked from the top of
+-- the ladder down so a renown total that clears several thresholds at once
+-- always resolves to the hardest-earned name rather than the first match.
+function Titles.forRenown(renown)
+  for i = #Titles.LADDER, 1, -1 do
+    if renown >= Titles.LADDER[i].threshold then return Titles.LADDER[i].name end
+  end
+  return Titles.LADDER[1].name
+end
+
+-- Renown still needed to clear the next threshold above `renown`, or nil
+-- once renown has already cleared the top of the ladder and there is
+-- nothing left to climb toward.
+function Titles.toNext(renown)
+  for _, tier in ipairs(Titles.LADDER) do
+    if renown < tier.threshold then return tier.threshold - renown end
+  end
+  return nil
+end
+
+return Titles
diff --git a/src/vaults.lua b/src/vaults.lua
new file mode 100644
index 0000000..d0a9659
--- /dev/null
+++ b/src/vaults.lua
@@ -0,0 +1,64 @@
+-- Lever-gated treasure rooms. A vault door only swings open once every lever
+-- sharing its id has been pulled; the builder places the door at a doorway
+-- pinch point and scatters its levers only on the side already reachable
+-- without crossing it, so the puzzle is always solvable and the reward
+-- sealed behind the door is always genuinely gated by it (see builder.lua's
+-- vault placement, drawn dead last so it never perturbs any earlier
+-- system's rng sequence).
+
+local Items = require("items")
+local Affixes = require("affixes")
+
+local Vaults = {}
+
+local treasureWeapons = {
+  { name = "vault greatsword", power = 7 },
+  { name = "vault warhammer",  power = 8 },
+}
+local treasureArmors = {
+  { name = "vault aegis", power = 6 },
+}
+
+-- A guaranteed affix on a base already well above anything the floor's own
+-- loot table can roll at this depth - the deterministic reward for solving
+-- the puzzle, distinct from a normal drop's coin-flip affix (see
+-- affixes.rollWeapon/rollArmor).
+function Vaults.treasure(rng, depth)
+  if rng:chance(1, 2) then
+    local base = treasureWeapons[rng:range(1, #treasureWeapons)]
+    local item = Items.weapon(base.name, base.power + depth // 3)
+    return Affixes.decorate(item, Affixes.weapon[rng:range(1, #Affixes.weapon)])
+  end
+  local base = treasureArmors[rng:range(1, #treasureArmors)]
+  local item = Items.armor(base.name, base.power + depth // 3)
+  return Affixes.decorate(item, Affixes.armor[rng:range(1, #Affixes.armor)])
+end
+
+function Vaults.doorFor(level, id)
+  for _, door in ipairs(level.vaultDoors) do
+    if door.id == id then return door end
+  end
+  return nil
+end
+
+local function allPulled(level, id)
+  for _, lever in ipairs(level.vaultLevers) do
+    if lever.id == id and not lever.pulled then return false end
+  end
+  return true
+end
+
+-- Pulls `lever`, an idempotent no-op returning false if it was already
+-- thrown. Returns (true, door) the instant this pull completes every lever
+-- sharing its id and the door has not opened yet, or (true, nil) for a pull
+-- that leaves the vault still sealed (or already open).
+function Vaults.pull(level, lever)
+  if lever.pulled then return false end
+  lever.pulled = true
+  if not allPulled(level, lever.id) then return true, nil end
+  local door = Vaults.doorFor(level, lever.id)
+  if door and not door.opened then return true, door end
+  return true, nil
+end
+
+return Vaults