I think Inv synergies better with DM than WP.
One of the biggest draws to DM is Siphon Life, and WP being based on regen gets proportionally less out of it than Invul, which has better def/res numbers but pays for it by lacking any kind of regen.
Dark Consumption is great for endurance ; again, better for Invul than WP because Invul lacks an endurance recovery power. It can also turn Unstoppable from a power you don't want to use ever because of the crash to a mere inconvenience (refill end with DC as you crash, hit DP immediately after, and you're back in business).
DM benefits a lot from +recharge ; Inv also sees improvements from +rech (DP, Unstop), while WP gets nothing from +rech.
Basically, DM plugs most of the holes Invul has. You'll still be lacking psi/res def, but between ~2900hp and a 300hp heal every few seconds (plus, eventually, positional defense you might grab from weave, CJ, IOs and set bonuses), you can still survive a fair amount of psi damage.
That's not to say that DM/WP wouldn't be a perfectly fine toon to play, but I believe DM and Invul really work well together.
Hi guys, finally getting around to a characteridea that I've had for a little while. See, I am going to make a Bone Daddy themed character. He should be able to group well, survive the Apocalypse, and pump out serious damage. My question is, which secondary, /Inv or /Wp, and why?
Willpower has more passive regen than Regen does. Who thought that was a good idea?
Can we get a fix for Energy Melee instead of more new sets?