DM/Stone -
Two Brute techniques and how these powers accomplish them:
Herding - This is the build for you if you were accomplished at corner-stacking with your pre-I5 AoE tank, and would like to get back a smidgeon of the glory you loved with your AoE tank. In the current issue, it's all about corner herding and shadow mauling with hasten and your granite armor and rooted on. You compensate somewhat for the max target cap by using a high recharge multiple target power, shadow maul, which you can boost to recharge almost as fast as brawl. You need to be accomplished at corner-stacking mobs because shadow maul is limited to a fairly wide cone area. You'll need teleport to move, or a speed boost from a teammate to move with granite armor & rooted running. Three slotting swift helps a little, and anything that helps a little becomes essential when you're moving this slow. Get taunt so that you don't have to run to every mob you're herding. When it comes to taking the herd down, a high recharge speed multiple target atteck is necessary in order to optimize your herd slaughtering experience in the post I5 world. That's where shadow maul comes in. Forget any other AT for taking down a reasonable herd, unless you'd like to herd -2s with your cor(which actually can be kind of fun). Granite will give you the ability to herd most +1 and +2 mobs. If your team can boost it with a shield and manuevers you're usually handling agro from +3 and even +4 or higher mobs comfortably. Soul drain and dark consumption are short-range multiple target attacks (I won't say AoE post-I5), that each come with their own buffs/debuffs, that are not essential, but are very nice and useful touches to the build.
PVP - The strategy works like this: TP Foe your enemy into your mud pots which will slow him. Preferably you do this when he doesn't know where you are. That way, although his toon may not be confused, technically, he likely will be, sitting behind his computer trying to figure out where his toon is, and not able to move quickly. Keep him that way, try brawl 1st to detoggle him in case he's running anything, then try terrifying him with touch of fear or immobilizing him with Midnight Grasp, usually one will work. Then just do all the damage you can and hope you win. Leave your granite armor and rooted on, just in case he survives somehow. Don't forget to throw in a few brawls here and there. Important note: running both granite and rooted is advised here, because if you are detoggled, usually only one will turn off at a time, and it will almost always be rooted, so you keep your granite armor and survive. Some of the damage builds out there will take you out nearly instantly if they can get your shield off. It's a good thing that rock armor is always recharged and ready to go while you wait for granite to recharge. Also, having the inherent damage resistance of stone skin helps in detoggle situations. Unfortunately, nothing in this build helps keep you from being terrorized. Fortunately, being terrorized doesn't detoggle you.
General Notes:
You do need stamina with this build, because it is a build designed to work with the max target cap. Therefor it uses a lot of recharge reductions, and therefor it uses end much faster. It always helps to have health with a melee toon, and when running rooted, earthen embrace, health, and attacking with siphon life, the health recovery rate is considerable. I have read that it is necessary to have tough and weave in order to max out the defense and damage resistance of a Stone armor Brute, but honestly, I just haven't felt any need to improve these areas, so I wouldn't recommend giving up any of the other powers for the fighting set.
Here's my DM/Stone build:
I had to build my DM/Stone without a guide. Now that I have done it & have a lvl40 DM/Stone I like, and I still can't find a build guide for DM/Stone, I will give some guidance. So here's a DM/Stone guide (I used Sherkhan's CoH/CoV Character Builder to plan it):
01) --> Smite==> Dmg(1) Dmg(7) Dmg(7)
01) --> Rock Armor==> DefBuf(1) DefBuf(3) DefBuf(27)
02) --> Stone Skin==> DmgRes(2) DmgRes(3) DmgRes(27)
04) --> Shadow Maul==> Dmg(4) Dmg(5) Dmg(5) Acc(13) Acc(13) Rechg(15)
06) --> Teleport Foe==> Acc(6)
08) --> Siphon Life==> Heal(8) Heal(9) Acc(9) Rechg(15) Heal(19) Acc(19)
10) --> Mud Pots==> Dmg(10) Dmg(11) Slow(11) Dmg(37)
12) --> Taunt==> Taunt(12)
14) --> Teleport==> Range(14)
16) --> Rooted==> Heal(16) Heal(17) Heal(17)
18) --> Dark Consumption==> Dmg(18) Rechg(31) Rechg(31) Rechg(34)
20) --> Swift==> Run(20) Run(21) Run(21)
22) --> Health==> Heal(22) Heal(23) Heal(23)
24) --> Stamina==> EndRec(24) EndRec(25) EndRec(25)
26) --> Soul Drain==> Dmg(26) Rechg(33) Rechg(34) Rechg(37) Dmg(37)
28) --> Earth's Embrace==> Heal(28) Heal(29) Rechg(29) Rechg(40)
30) --> Hasten==> Rechg(30) Rechg(31) Rechg(34)
32) --> Midnight Grasp==> Acc(32) Acc(33) Acc(33) Dmg(36) Dmg(36) Dmg(36)
35) --> Touch of Fear==> Acc(35)
38) --> Granite Armor==> DefBuf(38) DefBuf(39) DmgRes(39) DmgRes(39) DefBuf(40) DmgRes(40)
---------------------------------------------
01) --> Sprint==> Jump(1)
01) --> Brawl==> Acc(1)
01) --> Fury==> Empty(1)
02) --> Rest==> IntRdx(2)
Most of what I have said so far refers to granite a lot. This build is also very fun pre-granite. Just use rock armor where you would have used granite. With stone you can only herd same to +1 mobs without buffs, but at the same time you can move much faster, and your recharge speed is faster, with rock armor than granite.
Also, need I say, when I see a Stone Armor AT with brimstone, crystal or minerals armors, I know he's a newb. I will admit, though, I tried them once myself, but only on test. Those aren't worth wasting your time with, even on test. You might as well get fly with this build (my 1st toon ever , a long time ago, was a Stone/Fire tank, and, sadly, I did get fly as my 1st travel power with this AT <<solemnly states with head bowed>>

. But, hey, it's all good.