Mesh Hong, that is a nice build!
However, it has the glaring problem most Solo Soldiers and Brute have.. which is onely one action for each 5+ the party has...
Take another look.
For the first 325 HPs it has :
- 2 action points to spend
- a burst 8 stun power (which can be the equivalent of an extra action)
- a recharge burst 2 that should be able to target 3 PCs
- an at will that does 2 attacks, reach 2 and reach 3 (and lets the Aspect shift away from targets)
- threatening reach (3) which means it gets opportunity attacks from PCs moving up to attack it, or using ranged attacks within 3 squares (and if it keeps moving away 2 squares it forces melee characters to take the attacks)
That actually adds up to a lot more than 1 action for the parties 5+
Then at bloodied:
- it heals and regains an action point
- it has 2 full turns a round (2 lots of minor, move and standard)
- it gains the use of a close blast 5 that dominates 1 target (which is like gaining an extra action)
Other design considerations:
- variable resistance
- minor action to remove any status effect (other than stun)
Again, this creature is very busy and can do a lot more than 1 action for the parties 5+.
If you think I have missed something please explain, my Monster Maker gut instinct is telling me that this creature is a reasonable threat for a mid paragon party. But I am only human and might be overlooking something glaring obvious.