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With a combination of one item and one skill power, you can jump, climb, and bust down doors with your acrobatics instead of athletics or strength.

The pieces:
Nimble Shoes - property lets you use acrobatics in place of athletics for all purposes
Kord's Force - at-will skill power lets you make athletics check instead of a strength check

From there, we want to get our Acrobatics as high as possible.

Halfling is a good race with dex bonus and bonus to acrobatics. A background with an acrobatics bonus is nice too. Agile Athlete feat lets you roll twice and take the better. Sure Climber will let you climb at your full speed with your ample acrobatics (but requires athletics training, but that's needed for Kord's Force anyway). Skill Focus Duelist's Panache is the best feat bonus we'll get here at +CHA mod. As far as item bonuses go, Ring of Unfettered Motion or Dynamic Belt both look good, Dynamic Belt giving the biggest bonus in Epic, though Acrobat's Harness will save you a feat.

In the Rules Compendium p175, the strongest door listed is forcing open an adamantine portcullis at DC 35, which is pretty easy to guarantee by mid-paragon. One standard action acrobatics check and the nigh indestructible portcullis flies open.

To pull a full Kool-Aid man, the DC given to break down a 1 foot thick masonry wall also has a DC 35, so once again, the halfling is able to almost effortlessly plow through the wall with his acrobatics.

So, hopefully some of you can have some fun with this.

Here's a level 12 skeleton build with +30 Acrobatics and rolling twice, using acrobatics in place of any athletics or strength check and can climb at full speed.

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So as you can see, there is still plenty of room for all the usual combat related things while still having ultra mobility and the ability to pretty reliably go Kool-Aid Man (Only need a 5 or better out of 2 rolls, so 96% success rate against DC 35). The Great Leap rogue power will let you jump a minimum of 6 squares from a standstill, so that might be worthwhile too since you can you can exceed your speed with it and get as much as 10 squares on on long jump.

[EDIT]

With the Arcane Trickster PP we can do the same things though not quite as easily due to the requirements.
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I attemted to make Arcana do as much as possible in this build, which unfortunately meant not getting quite as high as possible as this level (2 points from background, though I felt the re-roll was more valuable, and one point from not maxing INT. The feat bonus to Arcana was also only +3 from skill focus, and the item bonus only +1 (+2 was available in runic armor, but half the benefits were not useful as we have no arcane powers, and Karruk's Circlet is not available in LFR. But we still have a +21 arcana that we can always re-roll and take the 2nd if the 1st roll is unsatisfactory, and we use it for Athletics, Strenght Checks, Insight, Perception, and Endurance (while bloodied), as well as either Bluff, Diplomacy, or Intimidate once per encounter, so Arcana is definitely pulling it's weight. And it may be slightly more understandable using one's understanding of magic to cause a wall to explode.

[Edit] And with the mention of bard, here's another Arcana smasher that's a little less convoluted (though spends more feats to get the same outcome).

Spoiler: Show

The power selection is just a quick and semi-thematic pick. Good at all the important social skills, as well as excellent with arcana and the 4 other skills it substitutes for. Sure Climber and Long Jumper will probably be desired at some point in there for maximum mobility, but other more leader oriented stuff would probably be a higher priority.

Mar 17, 2011 -- 10:08AM, kilpatds wrote:

Isn't there a feat to let you add your Cha Mod to your acrobatics checks?  You're an artful dodger halfling anyway, right?

Excellent, I felt like I was missing a better alternative to Skill Focus.

Mar 17, 2011 -- 11:16AM, Mirtek wrote:

I remember a thread where you could "talk down a wall" through a combination of feats that allowed you to use diplomacy (or history, don't remember exactly),

 

Heh, that would be pretty amusing too. Now I've got to find that.

Mar 17, 2011 -- 11:52AM, WEContact wrote:

What a terrifying picture you've found/made.

Yeah, cropped out the halfling from the fling ally illustration from whatever book that is pasted on a generic bursting brick wall background. That halfling is pretty pissed looking...