I recently pitted my party against an advanced HD manticore. I posted it over in the rules forum after asking about CR-scaling stuff, but here it is again. Prepare to meet the M.O.A.M...
M.O.A.M. (MOTHER OF ALL MANTICORES)
Huge Magical Beast
Hit Dice: 18d10+126 (225 hp)
Initiative: +6
Speed: 30 ft. (6 squares), fly 50 ft. (clumsy)
Armor Class: 19 (–2 size, +2 Dex, +9 natural), touch 10, flat-footed 17
Base Attack/Grapple: +18/+35
Attack: Claw +27 melee (2d6+9) or 6 spikes +21 ranged (2d6+4/17–20)
Full Attack: 2 claws +27 melee (2d6+9) and bite +25 melee (2d6+4); or 6 spikes +21 ranged (2d6+4/17–20)
Space/Reach: 15 ft./10 ft.
Special Attacks: Spikes
Special Qualities: Darkvision 60 ft., low-light vision, scent
Saves: Fort +18, Ref +13, Will +7
Abilities: Str 28, Dex 14, Con 24, Int 8, Wis 12, Cha 9
Skills: Listen +11, Spot +15, Survival +1
Feats: Flyby Attack, Multiattack, TrackB, Weapon Focus (spikes), Improved Initiative, Hover, Improved Critical (spikes), Wingover
Environment: Warm marshes, Hills
Organization: Solitary, sometimes encountered with younger, normal manticores
Challenge Rating: 10
Treasure: Standard
Alignment: Usually lawful evil
Advancement: 18 HD (Huge)
Level Adjustment: +3 (cohort)
A Mother of All Manticores (M.O.A.M.) is about 15 feet long and weighs about 3500 pounds. The name is slightly misleading, as it may refer to either a male or female of the species. The acronym for Father of All Manticores (F.O.A.M.) is not used as it would seem to imply a fun, squeezeable creature which is directly opposite of what it actually is. In fact, a M.O.A.M delights in squeezing its victims to death. M.O.A.M.s speak Common.
COMBAT
A M.O.A.M. begins most attacks with a volley of spikes, then closes. In the outdoors, it often uses its powerful wings to stay aloft during battle.
Spikes (Ex): With a snap of its tail, a manticore can loose a volley of six spikes as a standard action (make an attack roll for each spike). This attack has a range of 180 feet with no range increment. All targets must be within 30 feet of each other. The creature can launch only twenty-four spikes in any 24-hour period.
Skills: *M.O.A.M.s have a +4 racial bonus on Spot checks.