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Swamp Thing defends by creating massive amounts of party friendly difficult terrain and pulling his enemies into it.  Enemies will be slowed or immobilized much of the time on top of that and he uses World Serpent's Grasp and several other powers that prone as well.  He's a warden that takes several feats and powers to boost his toughness and defenses for once enemies are stuck next to him. 

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Ways it generates difficult terrain (almost of all of which is party friendly): Hungry Earth, Form of Winter’s Herald, Stone Panoply (from level 5 on), Rampant Forest, Tremor Step, Awaken the Forest (won’t see much use since its standard action), Drown In Mud (only non-party friendly one), and at 11 every square adjacent to Swamp Thing is difficult terrain for enemies while in guardian form.

Ways Swamp Thing extends reach: action points extend reach for a round while in guardian form and several forms extend reach: Form of the Oak Sentinel, Form of the Rowan Sentinel, and Form of the Verdant lord.  Both Thorn Strike and flurry of blows have reach 2 by default, but can get to 4 with action point while in certain guardian forms (on second reading, not sure those two powers get extended since they have specific reaches already).

It has an at will that pulls and an encounter power in Eternal Tide Flurry of Blows that pulls and potentially slows multiple enemies 2 squares away from you (even farther depending on if you spent an action point in paragon and what guardian form you have going).  Has Warden’s Lure as well at 17 for some more encounter pulling.

Has CA much of the time in heroic with Terrain Advantage and practically constant CA against adjacent enemies in paragon and epic.  Ways it takes advantage of this: Mark of finding lets you shift after anyone that tries to shift away while you have CA, Nimble blade is an extra +1 to hit,  defensive advantage is a boost of 2 to ac in epic, and opportunistic withdrawl makes you not worry about OAs.  Eyes in the back of his head means even though he will be surrounded most of the time, he won't be granting CA from it.

Race is tough since for a couple of feats you need a starting 15 dex, but goliath, thrikreen, half orc, snefrneblin, or shifter would all work ok.  Githzerai works too if you don’t mind a starting 18 10 15 8 15 10 stat spread and that lets you take Zuokens Centering in paragon instead of in epic, which is an additional 4-6 surges and hit points depending on your level. 

You could switch out lifespirit with the equivalent wildblood and some wildblood powers, but the lifespirit works decently here since several of them help him handle the stickyness well and he won't be second winding much until epic.  He doesn't have any Guardian Might specfic feats except for lifespirit healing which he retrains out of fairly quickly.

Theme is earthforger since it has an encounter power that grants DR and generates difficult terrain starting at level 5 and the level 10 utility Tremor Step generates difficult terrian in an aura 2 and generates temp hitpoints.  Its other features makes second wind better and reduces forced movement.

Not much picked out for items so far, but looking for a few that let me avoid difficult terrain or give out things like forest walk since that fits the theme.  Needs a rapier, preferably one like a scorpion tail blade, vitality drinking weapon, tresspasser’s bane, frost, or something similar.  Battle standard of the tides would fit as well.

I just put 'Forest Walk' through the Compendium. There are three ways you can get it.

1. Forest Walk Feat. 11th level, trained in Nature. You ignore difficult terrain in encounter areas where the difficult terrain is the result of trees, underbrush, plants, or natural growth. Doesn't allow you to ignore difficult or challenging terrain. Considering you have your Feats all filled, I don't think this is the route you'll go, but I mention it because it is an option.

2. Boots of the Dryad. Level 5+ Uncommon Feet Slot item. Property gives Forest Walk, and has a daily that lets you teleport to a square adjacent to a tree, treant, or plant of your size or larger.

3. Silver Hart Clasp. Level 9+ Uncommon Neck Slot item. Properties give Forest Walk and a bonus to Stealth checks while in forests. Daily Utility Power allows you to spend a surge and end a poison effect currently affecting you (no save).

Personally, I think the Silver Hart clasp provides the best bang for your buck, but it's not available until mid-to-late Heroic.

Candle + shadow strider?

Just tried plugging everything into the builder for you, but ran into problems at Level 13+, as I don't know what you retrain out at each level. Also, you can't take Mythic Senses, as that feat is for Minotaurs, and you are Thri-Kreen/Dwarf/Githzerai. Unless, of course, there's something I'm missing, which is possible.

Overall, I like the build. I just wish it wasn't so DEX-dependant, as I'd love to make use of some of the stuff on my Dwarf Warden.