I swore I'd enter, and to this day, the CR 4 to 10 challenge remains one of my favorite threads. I got caught up in that real life thing, so it took me forever to get back to it. I finally posted one, and have yet to get any comments...so...here! He may be a bit overpowered...
U'shallah, the Slayer in Shadows
Templates (and base creatures) used, in order: Tauric (Grimlock/Dire Wolverine), Shadow Creature, Half (Black) Dragon, Monster of Legend
Large Outsider
Hit Dice: 7d10 + 70 (108 hp)
Initiative: +10 (+6 Dex, +4 improved initiative)
Speed: 45 ft, climb 15', fly 45 ft (average)
AC: 28 (-1 size, +6 Dex, +13 natural)
Attacks: 4 claws +22, bite +22
Damage: claw 1d8+15, bite 2d6+7+poison
Face/Reach: 5 ft by 10 ft/5 ft
Special Attacks: Rage, blindsight, breath attack, poison (1d6 Str/1d6 Str, DC 23)
Special Qualities: Scent; cold resist 12; shadow blend; regenerate 2; immunities; haste; greater damage
Saves: Fort +18, Ref +14, Will +8
Abilities: Str: 40, Dex: 23, Con: 31, Int: 14, Wis: 10, Cha: 12
Skills: Climb +23*, Hide +16*, Listen +12, Search +12, Spot +12, Intimidate +9, Move Silently +14
Feats: Alertness, Improved Initiative, Multiattack, Power Attack
Climate/Terrain: Underground, and wherever there are shadows...
Organization: Unique. (aren't ya glad?)
Challenge Rating: 10 by templates, but I'd say closer to 13/14
Treasure: Standard coins, standard goods (gems only), standard items
Alignment: Always Neutral Evil
Advancement: As Assissin
Naashaar, a little known lesser god of darkness and death had enemies - Paladins, Clerics of good gods - well, in truth, almost anything of good and the light. Deciding he needed a creature to eliminate threats to those that sacrificed in his name, he went to Uroklashnigriit, a young adult black dragon that paid him homage, and bade him choose a breeding partner among the Chosharr, a viscious tauric folk created long ago by an evil sorcerror on the plane of shadow. To the spawn of this evil union, he bestowed Monster of Legend.
U'shallah is pleased to serve. He is viscious and sadistic, but quite intelligent. Some 18 sleek feet in length, his near coal-black body is furred wherever there are no scales - that being mostly his belly. U'shalla's wingspan is close to 25' at full extension.
Combat: U'shallah waits in the shadows until the time is right, and then charges directly into an enemy from behind, using a full move, and ripping and tearing in a full attack at one target at a time from surprise. If the initial attack doesn't seem to show significant progress, he'll disappear back into the shadows.
Breath Weapon: Once a day, U'shalla can breathe acid in a 60 ft line for 6d4 dmg (DC 23 Ref for half).
Rage (Ex): When U'shalla takes damage in combat he flies into a berserk rage on its next turn, clawing and biting madly until either it or its opponent is dead. An enraged dire wolverine gains +4 Strength, +4 Constitution, and -2 AC. The creature cannot end its rage voluntarily.
Blindsight (Ex): U'shallah can sense all foes within 40 feet as a sighted creature would. Beyond that range, they treat all targets as having total concealment.
U'shallah is susceptible to sound- and scent-based attacks, however, and are affected normally by loud noises and sonic spells (such as ghost sound or silence) and overpowering odors (such as stinking cloud or incense-heavy air). Negating his sense of smell or hearing reduces this ability to normal Blind-Fight (as the feat). If both these senses are negated, he is effectively blinded.
Shadow Blend (Su): In any conditions besides full daylight, U'shalla can disappear into shadow, granting him 9/10 concealment.
Haste (Su): U'shallah is supernaturally quick and can take an extra partial action every turn, as if affected by a haste spell.
Immunities: U'shallah is immune to sleep, paralysis, acid, gaze attacks, visual effects, illusions, and other attack forms that rely on sight.
Skills: *U'shallah's dull blackish skin helps him hide in his native terrain, conferring a +10 racial bonus on Hide checks when in mountains or underground and a +8 racial bonus on Climb checks and can always choose to take 10 on Climb checks, even if rushed or threatened.

U'shallah, the Slayer in Shadows
Templates (and base creatures) used, in order: Tauric (Grimlock/Dire Wolverine), Shadow Creature, Half (Black) Dragon, Monster of Legend
Large Outsider
Hit Dice: 7d10 + 70 (108 hp)
Initiative: +10 (+6 Dex, +4 improved initiative)
Speed: 45 ft, climb 15', fly 45 ft (average)
AC: 28 (-1 size, +6 Dex, +13 natural)
Attacks: 4 claws +22, bite +22
Damage: claw 1d8+15, bite 2d6+7+poison
Face/Reach: 5 ft by 10 ft/5 ft
Special Attacks: Rage, blindsight, breath attack, poison (1d6 Str/1d6 Str, DC 23)
Special Qualities: Scent; cold resist 12; shadow blend; regenerate 2; immunities; haste; greater damage
Saves: Fort +18, Ref +14, Will +8
Abilities: Str: 40, Dex: 23, Con: 31, Int: 14, Wis: 10, Cha: 12
Skills: Climb +23*, Hide +16*, Listen +12, Search +12, Spot +12, Intimidate +9, Move Silently +14
Feats: Alertness, Improved Initiative, Multiattack, Power Attack
Climate/Terrain: Underground, and wherever there are shadows...
Organization: Unique. (aren't ya glad?)
Challenge Rating: 10 by templates, but I'd say closer to 13/14
Treasure: Standard coins, standard goods (gems only), standard items
Alignment: Always Neutral Evil
Advancement: As Assissin
Naashaar, a little known lesser god of darkness and death had enemies - Paladins, Clerics of good gods - well, in truth, almost anything of good and the light. Deciding he needed a creature to eliminate threats to those that sacrificed in his name, he went to Uroklashnigriit, a young adult black dragon that paid him homage, and bade him choose a breeding partner among the Chosharr, a viscious tauric folk created long ago by an evil sorcerror on the plane of shadow. To the spawn of this evil union, he bestowed Monster of Legend.
U'shallah is pleased to serve. He is viscious and sadistic, but quite intelligent. Some 18 sleek feet in length, his near coal-black body is furred wherever there are no scales - that being mostly his belly. U'shalla's wingspan is close to 25' at full extension.
Combat: U'shallah waits in the shadows until the time is right, and then charges directly into an enemy from behind, using a full move, and ripping and tearing in a full attack at one target at a time from surprise. If the initial attack doesn't seem to show significant progress, he'll disappear back into the shadows.
Breath Weapon: Once a day, U'shalla can breathe acid in a 60 ft line for 6d4 dmg (DC 23 Ref for half).
Rage (Ex): When U'shalla takes damage in combat he flies into a berserk rage on its next turn, clawing and biting madly until either it or its opponent is dead. An enraged dire wolverine gains +4 Strength, +4 Constitution, and -2 AC. The creature cannot end its rage voluntarily.
Blindsight (Ex): U'shallah can sense all foes within 40 feet as a sighted creature would. Beyond that range, they treat all targets as having total concealment.
U'shallah is susceptible to sound- and scent-based attacks, however, and are affected normally by loud noises and sonic spells (such as ghost sound or silence) and overpowering odors (such as stinking cloud or incense-heavy air). Negating his sense of smell or hearing reduces this ability to normal Blind-Fight (as the feat). If both these senses are negated, he is effectively blinded.
Shadow Blend (Su): In any conditions besides full daylight, U'shalla can disappear into shadow, granting him 9/10 concealment.
Haste (Su): U'shallah is supernaturally quick and can take an extra partial action every turn, as if affected by a haste spell.
Immunities: U'shallah is immune to sleep, paralysis, acid, gaze attacks, visual effects, illusions, and other attack forms that rely on sight.
Skills: *U'shallah's dull blackish skin helps him hide in his native terrain, conferring a +10 racial bonus on Hide checks when in mountains or underground and a +8 racial bonus on Climb checks and can always choose to take 10 on Climb checks, even if rushed or threatened.
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