diff --git a/src/fot/attributes.rs b/src/fot/attributes.rs
index d17705c..530881a 100644
--- a/src/fot/attributes.rs
+++ b/src/fot/attributes.rs
@@ -1,3 +1,5 @@
+use crate::fot::decoder::Decoder;
+
 use super::esh::{ESHValue, ESH};
 use super::stream::{ReadStream, WriteStream};
 use super::tag::Tag;
@@ -256,6 +258,10 @@ const ADDICTIONS: [&str; 10] = [
 #[derive(Debug)]
 pub struct Attributes {
     esh: ESH,
+    size1: u32,
+    size2: u32,
+    tag: Tag,
+    enc_size: usize,
     pub stats: IndexMap<&'static str, u32>,
     pub traits: IndexMap<&'static str, u32>,
     pub derived: IndexMap<&'static str, u32>,
@@ -270,7 +276,7 @@ impl Attributes {
     pub fn from_binary(bin: &[u8]) -> Result<Self> {
         let mut rd = ReadStream::new(bin, 0);
 
-        let _ = rd.read_u32()?;
+        let size1 = rd.read_u32()?;
         let esh: ESH = rd.read()?;
         if esh.props["Binary"] == ESHValue::Bool(false) {
             return Err(anyhow!("Attributes Binary == false"));
@@ -288,8 +294,8 @@ impl Attributes {
         if let ESHValue::Binary(binary) = &esh.props["esbin"] {
             let mut rd = ReadStream::new(&binary, 0);
 
-            let _ = rd.read_u32()?;
-            let _: Tag = rd.read()?;
+            let size2 = rd.read_u32()?;
+            let tag: Tag = rd.read()?;
 
             for i in 0..MAX_STATS {
                 stats.insert(STATS[i], rd.read_u32()?);
@@ -316,8 +322,13 @@ impl Attributes {
                 addictions.insert(ADDICTIONS[i], rd.read_u32()?);
             }
 
+            let enc_size = binary.len();
             Ok(Attributes {
                 esh,
+                size1,
+                size2,
+                tag,
+                enc_size,
                 stats,
                 traits,
                 derived,
@@ -331,4 +342,47 @@ impl Attributes {
             return Err(anyhow!("Attributes has no esbin"));
         }
     }
+
+    pub fn into_binary(mut self) -> Result<Vec<u8>> {
+        let esbin = {
+            let mut wd = WriteStream::new(self.enc_size);
+
+            wd.write_u32(self.size2)?;
+            wd.write(&self.tag)?;
+
+            for (_, value) in self.stats {
+                wd.write_u32(value)?;
+            }
+            for (_, value) in self.traits {
+                wd.write_u32(value)?;
+            }
+            for (_, value) in self.derived {
+                wd.write_u32(value)?;
+            }
+            for (_, value) in self.skills {
+                wd.write_u32(value)?;
+            }
+            for (_, value) in self.skill_tags {
+                wd.write_bool(value)?;
+            }
+            for (_, value) in self.opt_traits {
+                wd.write_bool(value)?;
+            }
+            for (_, value) in self.perks {
+                wd.write_u32(value)?;
+            }
+            for (_, value) in self.addictions {
+                wd.write_u32(value)?;
+            }
+
+            wd.into_vec()
+        };
+        self.esh.set("esbin", ESHValue::Binary(esbin));
+
+        let mut wd = WriteStream::new(self.esh.get_enc_size());
+        wd.write_u32(self.size1)?;
+        wd.write(&self.esh)?;
+
+        Ok(wd.into_vec())
+    }
 }
diff --git a/src/fot/entity.rs b/src/fot/entity.rs
index 78b7ee5..c02d7d3 100644
--- a/src/fot/entity.rs
+++ b/src/fot/entity.rs
@@ -42,6 +42,13 @@ impl Entity {
             Err(anyhow!("Attributes is not binary"))
         }
     }
+
+    pub fn set_attributes(&mut self, attrs: Attributes) -> Result<()> {
+        self.get_esh_mut()?
+            .set("Attributes", ESHValue::Binary(attrs.into_binary()?));
+
+        Ok(())
+    }
 }
 
 impl DecoderCtx<&mut EntityList, &EntityList> for Entity {
diff --git a/src/fot/entitylist.rs b/src/fot/entitylist.rs
index a29306d..498cf7c 100644
--- a/src/fot/entitylist.rs
+++ b/src/fot/entitylist.rs
@@ -62,6 +62,10 @@ impl EntityList {
         &self.ents[id - 1]
     }
 
+    pub fn get_entity_mut(&mut self, id: usize) -> &mut Entity {
+        &mut self.ents[id - 1]
+    }
+
     pub fn dump_to_entfile(&self, ent: &Entity, path: &Path) -> Result<()> {
         let esh = match &ent.esh {
             Some(esh) => esh,
diff --git a/src/fot/world.rs b/src/fot/world.rs
index d22b83b..462b9ca 100644
--- a/src/fot/world.rs
+++ b/src/fot/world.rs
@@ -38,7 +38,8 @@ impl World {
 
     pub fn test(&mut self) -> Result<()> {
         //let actor_type = self.entlist.get_type_idx("Actor").unwrap();
-        let ent = self.entlist.get_entity(2122);
+        //let ent = self.entlist.get_entity_mut(2122);
+        let ent = self.entlist.get_entity_mut(2158);
         let esh = ent.get_esh()?;
         for (name, value) in &esh.props {
             println!("{} {}", name, value);
@@ -46,8 +47,23 @@ impl World {
         //self.entlist.dump_to_entfile(ent, Path::new("D:\\actor.ent"))?;
 
         println!("");
-        let attributes = ent.get_attributes()?;
-        dbg!(attributes);
+        let mut attributes = ent.get_attributes()?;
+        if let ESHValue::Binary(bin) = &esh.get("Attributes").unwrap() {
+            dbg!(bin.len());
+        }
+        attributes.stats["strength"] = 10;
+        attributes.stats["perception"] = 10;
+        attributes.stats["endurance"] = 10;
+        attributes.stats["charisma"] = 10;
+        attributes.stats["intelligence"] = 10;
+        attributes.stats["agility"] = 10;
+        attributes.stats["luck"] = 10;
+        ent.set_attributes(attributes)?;
+
+        let esh = ent.get_esh()?;
+        if let ESHValue::Binary(bin) = &esh.get("Attributes").unwrap() {
+            dbg!(bin.len());
+        }
 
         Ok(())
     }
diff --git a/src/main.rs b/src/main.rs
index 667ccf7..e5ae789 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,5 +15,5 @@ fn main() {
 
     let mut save = Save::load(Path::new(save_path)).expect("load save");
     save.world.test().expect("test");
-    //save.save(Path::new("out.sav")).expect("failed to save");
+    save.save(Path::new("out.sav")).expect("failed to save");
 }