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Due to scheduling problems the player playing our goliath fighter cannot play in our game any more. This unfortunately leaves me, the assault swordmage who always paled in comparison to the fighters astonishing defender abilities. Now I have to step up to the plate and try to keep the elven vampire, eladrin wizard (arcanist) master of flame, and dwarf priest (templar) radiant servant alive. So I turn to you oh board of optimizers extrodinare, what can I do to adjust my feats and powers to better suit this role? I know my gm will allow some adjusting in these areas but there's no way he'll let me change anything major like race or paragon path or whatever. 
Oh, and if past experience is any indicator my job will mostly be to keep all the bad guys off the cleric her defenses are terrible but her heals are amazing  

Thanks in advance for whatever help you can provide


====== Created Using Wizards of the Coast D&D Character Builder ======
Zan-Kyri, level 14Genasi, Swordmage, Academy Master
Swordmage Aegis Option: Aegis of Assault
Versatile Expertise Option: Versatile Expertise (Heavy Blade)
Versatile Expertise Option: Versatile Expertise (Axe)
Elemental Manifestation Option: Windsoul
Extra Manifestation Option: Watersoul
Akanûl (Akanûl Benefit) 
FINAL ABILITY SCORES STR 13, CON 19, DEX 14, INT 22, WIS 9, CHA 15 
STARTING ABILITY SCORES STR 12, CON 13, DEX 13, INT 16, WIS 8, CHA 14  
AC: 34 Fort: 25 Ref: 29 Will: 27HP: 112 Surges: 12 Surge Value: 28 
TRAINED SKILLS Arcana +20, Diplomacy +14, Endurance +18, History +18 
UNTRAINED SKILLSAcrobatics +10, Athletics +8, Bluff +9, Dungeoneering +6, Heal +6, Insight +6, Intimidate +9, Nature +8, Perception +6, Religion +13, Stealth +9, Streetwise +9, Thievery +9 
POWERS Basic Attack: Melee Basic Attack
Basic Attack: Ranged Basic Attack
Genasi Racial Power: Windwalker
Swordmage Feature: Aegis of Assault
Genasi Racial Power: Swiftcurrent
Swordmage Attack 1: Sword Burst
Swordmage Attack 1: Booming Blade
Swordmage Attack 1: Foesnare
Swordmage Attack 1: Lashing Asp
Swordmage Utility 2: Channeling Shield
Swordmage Attack 5: Swordmage Shielding Fire
Swordmage Utility 6: Armathor's Step
Swordmage Attack 7: Evoker's Summoning
Swordmage Attack 9: Blade Bolt
Swordmage Utility 10: Impenetrable Warding
Academy Master Attack 11: Learned Boost
Academy Master Utility 12: Refined Recall
Swordmage Attack 13: Binding Light
FEATS
Level 1: Intelligent Blademaster
Level 2: Versatile Expertise
Level 4: Improved Swordmage Warding
Level 6: White Lotus Riposte
Level 8: White Lotus Hindrance
Level 10: Extra Manifestation
Level 11: Superior Will
Level 12: Double Aegis
Level 14: Greater Swordmage Warding
 ITEMSLeather ArmorSnakefang Snakeskin Armor +4 x1Sunblade Khopesh +3 x1Acrobat Boots (heroic tier) x1Gauntlets of Arcane Might (heroic tier) x1Circlet of Second Chances (heroic tier) x1Cloak of Resistance +3 x1Viper Belt (heroic tier) x1CrossbowCrossbow BoltAdventurer's Kit====== End ======

I'd change your encounter powers to the following:
Foesnare -> Dual Lightning Strike(mobility+distributed damage)
Evoker's Summoning -> Dimensional Vortex(i.e. get off my Cleric now and pound your friend instead)
Binding Light -> Hypnotic Swordplay(Stun >> Immobilize)

Right now, your AC is high for a 14th level character. You could get rid of Improved Swordmage Warding for Superior Fortitude - that would lose you +1 to AC, but gain you +2 to Fortitude as well as significant resistance to ongoing damage.

White Lotus Riposte - I'd change that into Silvery Glow(requires worshippping Sehanine or Selune) given your Sunblade - that'll boost the damage of your attacks by +3 each...is there a reason this is a Khopesh? I'd make into a Longsword for the extra +1 to hit with weapon attacks. The reason for getting rid of it is that if you hit someone with an at-will, you're encouraging them to not attack you back, which is apparently a problem. You want them to attack you so they don't attack the cleric. Overall, you'll get the same damage that you normally do, as you'll make encounter/daily/mba attacks which don't benefit from Riposte anyway.

Assaulting swordmages really suck at tanking (I've tried it, it doesn't work well).  Since your character wasn't built for it, ask if your DM if you can change to the aegis of shielding and take either sigil carver or that other aegis of shielding paragon path, and you should pretty much be fine.

Assualy Swordmages can be fine defenders if you just pay a little extra care to power selection. Here's the list I've used extensively up to your level you don't have listed:


At-Will: Frigid Blade (slows enemy Con Mod)

Utility 2: Dimensional Warp (they surround your ally? Now they're surrounding you)


Encounter 3: Dimensional Vortex & Eencounter 13: Hypnotic Swordplay (as MwaO said)

...and yeah, dump the White Lotus feats. Don't give them less incentive to hit you besides defenses.       

Thanks for all the replies, I'll definately be adjusting my feats, powers and wish list. Alas I don't have access to dragonmarks and can't change to a shielding swordmage but even with these limitations I think I'll be able to do a pretty good job now. 
Feel free to keep any new ideas coming but I'm already kind of excited for my new role in the party.