diff --git a/.gitignore b/.gitignore
index 585ea5e..e982c57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 last_light
+last_light.exe
\ No newline at end of file
diff --git a/DESIGN.md b/DESIGN.md
index dacfc68..58b35e3 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -18,6 +18,7 @@
         - Fire
         - Cold
         - Necrotic
+        - Thunder
         - Acid
         - Poison
 - 9-level Dungeon
diff --git a/render/layers.go b/render/layers.go
index eda9053..bdfb574 100644
--- a/render/layers.go
+++ b/render/layers.go
@@ -37,6 +37,18 @@ func (l *layer) draw(s tcell.Screen) {
 	}
 }
 
+type unorderedDrawContainer struct {
+	id       uuid.UUID
+	contents []Drawable
+}
+
+func CreateUnorderedDrawContainer(contents []Drawable) unorderedDrawContainer {
+	return unorderedDrawContainer{
+		id:       uuid.New(),
+		contents: contents,
+	}
+}
+
 type layeredDrawContainer struct {
 	id     uuid.UUID
 	layers []*layer
diff --git a/ui/ui.go b/ui/ui.go
new file mode 100644
index 0000000..48ecf65
--- /dev/null
+++ b/ui/ui.go
@@ -0,0 +1,12 @@
+package ui
+
+import (
+	"mvvasilev/last_light/util"
+
+	"github.com/google/uuid"
+)
+
+type UIElement interface {
+	UniqueId() uuid.UUID
+	Position() util.Position
+}