Other Cubes
To give some examples of what I'm thinking about, with the previous post, here's a stab at the Diamond Cube:
Diamond Cube
Macro-Tiny Construct
Hit Dice: 5,120d10+480 (28,640 hp)
Initiative: +0
Speed: Fly 480' (Perfect)
Armor Class: 5,046 (+5,174 natural, -128 size), touch -118, flat-footed 5,046
Base Attack/Grapple: +3,840/+3,919
Attack: Slam +3,759 melee (10d10+47)
Full Attack: Slam +3,759 melee (10d10+47)
Space/Reach: 1,250 ft./1,250 ft.
Special Attacks: Cascading Slam, Crush, Duplicate, Hypnotic Pattern, Reconfigure, Sentinels, Tractor Beam
Special Qualities: Construct Traits, Damage Reduction 30/ - , Darkvision 60 ft., Fragile, Immunity to Magic, Low-Light Vision
Saves: Fort +1,706, Ref +1,706, Will +1,706
Abilities: Str 105 (+47), Dex 10, Con - , Int - , Wis 10, Cha 1
Environment: Any
Organization: Army (diamond cube plus 500 sentinels)
Challenge Rating: ???
Treasure: -
Alignment: Always neutral
Advancement: -
Level Adjustment: -
Combat
Cascading Slam (Su): Those struck by the slam of the diamond cube have the damage revisited upon themselves for 2d6 rounds unless they make a Reflex save (DC 2,570). Only one such saving throw is allowed each round. A successful save, or a successful Dispel Magic effect (against the same DC) halts all current cascading damage.
Crush (Ex): Colossal-sized or smaller opponents standing on, or adjacent to a solid surface struck by the diamond cube's Slam suffer 20d10+70 damage (instead of 10d10+47).
Duplicate (Su): If attacked by more than one opponent, the diamond cube creates a temporary duplicate of itself. The duplicate appears adjacent to its attacker. These duplicates share a single hit point total, but otherwise act independently. This ability has a range of 12,500 feet (2.3 miles, 10 x the cube's base Reach) from the initial cube. Only the initial cube has the Duplicate ability, not the duplicates. Any Sentinels (see below) created by the duplicates, however, are real and remain even if the creating duplicate is destroyed.
Fragile (Ex): Although incredibly hard, diamond is also inherently fragile. Constructs created from diamond are not immune to critical hits.
Hypnotic Pattern (Su): Any creatures within 3,750 feet (cube's Space x 3) of a diamond cube must make a Will save (DC 2,570) or become fascinated for 2d4 rounds.
Reconfiguration (Ex): The diamond cube can reconfigure itself once each round as a free action. Creatures engulfed by the diamond cube may, once each round as a full-round action, attempt to escape from the cube with a successful Intelligence check (DC 35). Success indicate they escape the cube, exiting the cube's fighting space into an open square of the cube's choice. Failure indicates they remained trapped within the cube. Failure by 20 or more indicates that the engulfed subjects not only remain trapped, but during their escape fall prey to some form of trap or ambush, and suffer 20d6 Slashing, piercing, bludgeoning, fire, or electricity damage (cube's choice). There is no save to negate this damage. Further, as long as the cube has 14,320 or more hit points remaining, it heals 5,120 hit points of damage each round it reconfigures itself.
Sentinels (Su): At the behest of it's creator, once per round, as a free action, a diamond cube can manufacture 1 diamond sentinel, 2 diamond golems, or 4 diamond guardians.
Tractor Beam (Su): Once per round, as a standard action, the diamond cube may attempt a ranged touch attack at +3,712 to hit against any foe within 17.5 miles. If this touch attack hits, the foe must make an opposed strength check against the diamond cube or be pulled 1250 ft towards the cube, +50 ft per 5 points by which the cube exceeds the foe's result. Foes pulled into the diamond cube's square are engulfed within it and cannot easily escape (see Reconfiguration ability, above).