Sentinel Ancilary Power Pools?

[DarZindel]

Sorry if this is posted elsewhere and I seem to have missed it. 

 

What are the ancilary power pools for Sentinels, and what are the powers within each.  Any suggested stronger/weaker ones (without keeping theme synergy in mind)?

 

Thanks!

[Sunsette]

I give a basic overview of them from my personal perspective here. The guide is nominally for Energy Blast but I intentionally tried to write generically.

[DarZindel]

A very well written and helpful guide, thanks for sharing!

[Heraclea]

I picked the Ninja version of caltrops (it has a weird name I don't remember in the set) on my water/WP sentinel.  It seemed to offer some synergy with my slows, and another place to put a Pacing of the Turtle -recharge proc.  None of the ancillary powers available without a redside turn seemed particularly enticing.  This will likely be the only power from the pool I will take; a ninja sword would be disconcerting, and the idea behind having caltrops is to discourage unwanted melee suitors.  I doubt I will pick up anything else from the pool.