This might not be a Mantle probem, but right before it crashes the console says the Mantle and Tinkers' Construct environments are healthy.
Crash log:
---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 12/15/14 10:06 AM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/common/Configuration
at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:515)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:239)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:286)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:376)
at org.multimc.EntryPoint.listen(EntryPoint.java:165)
at org.multimc.EntryPoint.main(EntryPoint.java:54)
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/common/Configuration
at imlookingatblood.pokefenn.ImLookingAtBlood.fmlPreInitiation(ImLookingAtBlood.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:513)
... 18 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.Configuration
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 45 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 47 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_71, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 284172840 bytes (271 MB) / 653262848 bytes (623 MB) up to 954728448 bytes (910 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.85.1264 Minecraft Forge 10.13.2.1264 34 mods loaded, 34 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized
FML{7.10.85.1264} Forge Mod Loader Unloaded->Constructed->Pre-initialized
Forge{10.13.2.1264} Minecraft Forge Unloaded->Constructed->Pre-initialized
CodeChickenCore{1.0.4.29} CodeChicken Core Unloaded->Constructed->Pre-initialized
NotEnoughItems{1.0.3.74} Not Enough Items Unloaded->Constructed->Pre-initialized
ThaumicTinkerer-preloader{0.1} Thaumic Tinkerer Core Unloaded->Constructed->Pre-initialized
Baubles{1.0.1.10} Baubles Unloaded->Constructed->Pre-initialized
Thaumcraft{4.2.1.4} Thaumcraft Unloaded->Constructed->Pre-initialized
Waila{1.5.6a} Waila Unloaded->Constructed->Pre-initialized
Automagy{0.15} Automagy Unloaded->Constructed->Pre-initialized
Botania{r1.3-139} [Botania](Botania r1.3-139.jar) Unloaded->Constructed->Pre-initialized
chisel{1.5.7} Chisel Unloaded->Constructed->Pre-initialized
EnderIO{1.7.10-2.2.3.306} Ender IO Unloaded->Constructed->Pre-initialized
EnderStorage{1.4.5.27} EnderStorage Unloaded->Constructed->Pre-initialized
ForgeMultipart{1.1.0.314} Forge Multipart Unloaded->Constructed->Pre-initialized
ExtraUtilities{1.2.0} Extra Utilities Unloaded->Constructed->Pre-initialized
FastCraft{1.9} FastCraft Unloaded->Constructed->Pre-initialized
McMultipart{1.1.0.314} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized
iChunUtil{4.1.2} iChunUtil Unloaded->Constructed->Pre-initialized
IGWMod{1.1.1-17} In-Game wiki Mod Unloaded->Constructed->Pre-initialized
ImLookingAtBlood{1.2} I'm Looking At Blood Unloaded->Constructed->Errored
journeymap{5.0.1} JourneyMap Unloaded->Constructed->Pre-initialized
Mantle{1.7.10-0.3.2.jenkins184} Mantle Unloaded->Constructed->Pre-initialized
Morph{0.9.1} Morph Unloaded->Constructed->Pre-initialized
Natura{2.2.0} Natura Unloaded->Constructed->Pre-initialized
RandomThings{2.2.2} Random Things Unloaded->Constructed->Pre-initialized
StevesFactoryManager{A93} Steve's Factory Manager Unloaded->Constructed->Pre-initialized
TConstruct{1.7.10-1.7.1.build771} Tinkers' Construct Unloaded->Constructed->Pre-initialized
ThaumicTinkerer{unspecified} Thaumic Tinkerer Unloaded->Constructed->Pre-initialized
TiCTooltips{1.1.11b} TiC Tooltips Unloaded->Constructed->Pre-initialized
TMechworks{1.7.10-86.e500b88} Tinkers' Mechworks Unloaded->Constructed->Pre-initialized
Translocator{1.1.1.14} Translocator Unloaded->Constructed->Pre-initialized
aobd{2.3.5} Another One Bites The Dust Unloaded->Constructed->Pre-initialized
ForgeMicroblock{1.1.0.314} Forge Microblocks Unloaded->Constructed->Pre-initialized
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.

Well, here's what to look for:
"ImLookingAtBlood{1.2} I'm Looking At Blood Unloaded->Constructed->Errored"

This is not Mantle's fault . Try redownloading that mod.