diff --git a/lib/sightstone/modules/summoner_module.rb b/lib/sightstone/modules/summoner_module.rb
index 156a19f..4e0a7ea 100644
--- a/lib/sightstone/modules/summoner_module.rb
+++ b/lib/sightstone/modules/summoner_module.rb
@@ -158,11 +158,11 @@ class SummonerModule < SightstoneBaseModule
     else
       summoner
     end
-    uri = "http://prod.api.pvp.net/api/lol/#{region}/v1.2/summoner/#{id}/masteries"
+    uri = "http://prod.api.pvp.net/api/lol/#{region}/v1.3/summoner/#{id}/masteries"
     response = _get_api_response(uri)
     _parse_response(response) { |resp|
       data = JSON.parse(resp)
-      book =  MasteryBook.new(data)
+      book =  MasteryBook.new(data.values[0])
       if block_given?
         yield book
       else
@@ -170,5 +170,36 @@ class SummonerModule < SightstoneBaseModule
       end
     }
   end
+
+  # returns the masterybooks for multiple summoners
+  # @param summoners [Array<(Summoner, Integer)>] list of summoner objects or ids of summoners
+  # @param optional [Hash<Symbol, String>] optional arguments: :region => replaces default region
+  # @return [Hash<Integer, Masterybook>] A hash mapping masterybooks to the ids of summoners
+  def masterybooks(summoners, optional={})
+    return {} if summoners.empty?
+    region = optional[:region] || @sightstone.region
+    ids = summoners.collect { |summoner|
+      if summoner.is_a? Summoner
+        summoner.id
+      else
+        summoner
+      end
+    }
+
+    uri = "http://prod.api.pvp.net/api/lol/#{region}/v1.3/summoner/#{ids.join(',')}/masteries"
+    response = _get_api_response(uri)
+    _parse_response(response) { |resp|
+      data = JSON.parse(resp)
+      books = {}
+      data.each do |key, raw_book|
+        books[key] = MasteryBook.new(raw_book)
+      end
+      if block_given?
+        yield books
+      else
+        return books
+      end
+    }
+  end
 end
 end
diff --git a/test/test_summoner_module.rb b/test/test_summoner_module.rb
index b76df60..bcb9bce 100644
--- a/test/test_summoner_module.rb
+++ b/test/test_summoner_module.rb
@@ -162,6 +162,40 @@ class SummonerModuleTest < BaseTest
       end
     end
   end
+
+  def test_summoner_masterybooks
+    begin
+      masterybooks = @@sightstone.summoner.masterybooks(@@test_id_array)
+    rescue Sightstone::RateLimitExceededException
+      puts "Rate limit exeeded, waiting 1 sec"
+      sleep 1
+      retry
+    end
+    masterybooks.each do |id, masterybook|
+      assert_equal(@@test_id_array[0], masterybook.summonerId)
+    assert_instance_of(Array, masterybook.pages)
+    if masterybook.pages.size > 0
+      # test a page
+      page = masterybook.pages[0]
+      if(page.current == true || page.current == false)
+        assert_equal(true, true)
+      else
+        assert_equal(page.current, "asd")
+      end
+      assert_instance_of(Fixnum, page.id)
+      assert_instance_of(String, page.name)
+      assert_instance_of(Array, page.talents)
+      
+      if(page.talents.size > 0)
+        # test talent
+        talent = page.talents[0]
+        assert_instance_of(Fixnum, talent.rank)
+        assert_instance_of(String, talent.name)
+        assert_instance_of(Fixnum, talent.id)
+      end
+    end
+    end
+  end
   
 
 end
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