These abilities only apply to the swarms, not to the swarmlord itself. I changed the wording to make this clearer.Agile Swarm
May I suggest refluffing this as a continuous swarm floating around the Swarmlord and change the dodge bonus to a deflection bonus?
Like Agile Swarm, I'd just suggest refluffing this as the swarm around the Swarmlord taking/mitigating the blow. Also, do you want this ability to allow Swarmlords to qualify for things that require the Evasion class feature? If so, you probably want to make a note of that.
Okay, then. Penetrating Swarm now ignores only 10 points of DR until 20th level.Penetrating Swarm
This ability is kind of powerful in my opinion. The Penetrating Strike feat only allows the ignoring of 5 points of DR (though doesn't affect DR X/-) and even then a Fighter can't take it until 12th level.
See, this still feels weak as a capstone to me. It's much better than your last one though. Maybe someone else can give an opinion on it, but I still feel that a capstone should be something flat out amazing.