Invul/Ice Build
Not bad, but keep in mind that the Gladiator's Armor +def IO was running about a *billion* influence last time I checked. So you probably shouldn't count on that as a source of defense unless you've got very deep pockets or were very lucky with a drop.
A few other things:
You should definitely pick up RPD at some point in your build. Not only will it let you cap S/L resistance, but it's one of the two powers in Invul that now give defense debuff resistance--Tough Hide is the other. With a soft-capped build you probably won't need Unstop, but dropping ResEn or Build-Up is also an option.
If you don't get the PvP unique, you'll be a little short of the soft-cap for E/NE, so I'd recommend finding another slot for Block of Ice and putting two Basilisk's Gaze in it for a 2.5% E/NE def bonus.
With the BG bonus and one of the resist passives (presuming you take two) 3-slotted with Reactive Armor, you'll be just above the soft-cap for E/NE. If that's the case, you might want to consider slotting the other resist passive with 3 Aegis for the F/C def bonus.
EDIT: By the way, if you take both RPD and ResEn (or RPD and Unstop) there's no point in 3-slotting both with RA; you're up against the "rule of 5" for 1.25% E/NE bonuses.
My Characters
Knight Court--A CoH Story Complete 2/3/2012

im right at 5 bonuses from those, and unslotting one drops my defense just below the soft cap. Here's the revised version.
Hero Plan by Mids' Hero Designer 1.401
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Mutation Tanker
Primary Power Set: Invulnerability
Secondary Power Set: Ice Melee
Power Pool: Fitness
Power Pool: Speed
Power Pool: Fighting
Ancillary Pool: Arctic Mastery
Hero Profile:
Level 1: Temp Invulnerability
- (A) Reactive Armor - Resistance/Endurance
- (3) Reactive Armor - Resistance/Recharge
- (7) Reactive Armor - Resistance/Endurance/Recharge
- (11) Reactive Armor - Resistance
- (33) Steadfast Protection - Resistance/+Def 3%
- (A) Kinetic Combat - Accuracy/Damage
- (15) Kinetic Combat - Damage/Endurance
- (31) Kinetic Combat - Damage/Recharge
- (33) Kinetic Combat - Damage/Endurance/Recharge
- (A) Doctored Wounds - Heal/Endurance
- (3) Doctored Wounds - Endurance/Recharge
- (7) Doctored Wounds - Heal/Recharge
- (17) Doctored Wounds - Heal
- (37) Doctored Wounds - Recharge
- (A) Positron's Blast - Accuracy/Damage
- (5) Positron's Blast - Damage/Endurance
- (5) Positron's Blast - Damage/Recharge
- (17) Positron's Blast - Damage/Range
- (33) Positron's Blast - Accuracy/Damage/Endurance
- (37) Detonation - Damage/Recharge
- (A) Jumping IO
- (A) Reactive Armor - Resistance/Endurance
- (9) Reactive Armor - Resistance/Recharge
- (9) Reactive Armor - Resistance/Endurance/Recharge
- (34) Reactive Armor - Resistance
- (A) Mocking Beratement - Taunt
- (11) Mocking Beratement - Taunt/Recharge
- (34) Mocking Beratement - Taunt/Recharge/Range
- (36) Mocking Beratement - Accuracy/Recharge
- (42) Mocking Beratement - Taunt/Range
- (42) Mocking Beratement - Recharge
- (A) Recharge Reduction IO
- (13) Recharge Reduction IO
- (13) Recharge Reduction IO
- (A) Miracle - +Recovery
- (15) Numina's Convalescence - +Regeneration/+Recovery
- (A) Reactive Armor - Resistance/Endurance
- (23) Reactive Armor - Resistance
- (36) Reactive Armor - Resistance/Recharge
- (A) Gift of the Ancients - Defense/Endurance
- (19) Gift of the Ancients - Defense/Recharge
- (19) Gift of the Ancients - Defense/Endurance/Recharge
- (27) Gift of the Ancients - Defense
- (A) Performance Shifter - EndMod
- (21) Performance Shifter - EndMod/Recharge
- (21) Performance Shifter - EndMod/Accuracy
- (27) Performance Shifter - Chance for +End
- (A) Recharge Reduction IO
- (23) Recharge Reduction IO
- (A) Recharge Reduction IO
- (25) Adjusted Targeting - Recharge
- (25) Adjusted Targeting - To Hit Buff/Recharge
- (A) Defense Buff IO
- (37) Defense Buff IO
- (40) Defense Buff IO
- (A) Kinetic Combat - Accuracy/Damage
- (29) Kinetic Combat - Damage/Endurance
- (29) Kinetic Combat - Damage/Recharge
- (31) Kinetic Combat - Damage/Endurance/Recharge
- (31) Basilisk's Gaze - Accuracy/Recharge
- (43) Crushing Impact - Accuracy/Damage/Recharge
- (A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range
- (34) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
- (A) Reactive Armor - Resistance/Endurance/Recharge
- (36) Reactive Armor - Resistance/Recharge
- (40) Reactive Armor - Endurance/Recharge
- (A) Kinetic Combat - Accuracy/Damage
- (42) Kinetic Combat - Damage/Endurance
- (46) Kinetic Combat - Damage/Recharge
- (50) Kinetic Combat - Damage/Endurance/Recharge
- (A) Eradication - Damage
- (39) Eradication - Accuracy/Recharge
- (39) Eradication - Accuracy/Damage/Endurance/Recharge
- (39) Cleaving Blow - Accuracy/Recharge
- (40) Cleaving Blow - Damage/Recharge
- (43) Cleaving Blow - Damage/Endurance
- (A) Basilisk's Gaze - Endurance/Recharge/Hold
- (43) Basilisk's Gaze - Accuracy/Endurance/Recharge/Hold
- (A) Thunderstrike - Accuracy/Damage
- (45) Thunderstrike - Damage/Endurance
- (45) Thunderstrike - Damage/Recharge
- (45) Thunderstrike - Accuracy/Damage/Recharge
- (46) Thunderstrike - Accuracy/Damage/Endurance
- (46) Thunderstrike - Damage/Endurance/Recharge
- (A) Reactive Armor - Resistance/Endurance
- (48) Reactive Armor - Resistance/Recharge
- (48) Reactive Armor - Resistance/Endurance/Recharge
- (48) Reactive Armor - Resistance
- (A) Defense Buff IO
- (50) Gift of the Ancients - Defense
- (50) Gift of the Ancients - Defense/Endurance
Level 1: Brawl
- (A) Empty
- (A) Empty
- (A) Empty
@Mazzo Grave

Webmaster Grave, Virtueverse!
Energy/Energy Blaster Guide
My Characters
Knight Court--A CoH Story Complete 2/3/2012

I finally got my Invul tank past 20 and I'm starting to enjoy it more and more. I've been working on this build for a while now and this is what I've come up with.
Hero Plan by Mids' Hero Designer 1.401
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Mutation Tanker
Primary Power Set: Invulnerability
Secondary Power Set: Ice Melee
Power Pool: Fitness
Power Pool: Speed
Power Pool: Fighting
Ancillary Pool: Arctic Mastery
Hero Profile:
Level 1: Temp Invulnerability
- (A) Reactive Armor - Resistance/Endurance
- (3) Reactive Armor - Resistance/Recharge
- (7) Reactive Armor - Resistance/Endurance/Recharge
- (11) Reactive Armor - Resistance
- (33) Steadfast Protection - Resistance/+Def 3%
Level 1: Frozen Fists- (A) Kinetic Combat - Accuracy/Damage
- (15) Kinetic Combat - Damage/Endurance
- (31) Kinetic Combat - Damage/Recharge
- (33) Kinetic Combat - Damage/Endurance/Recharge
Level 2: Dull Pain- (A) Doctored Wounds - Heal/Endurance
- (3) Doctored Wounds - Endurance/Recharge
- (7) Doctored Wounds - Heal/Recharge
- (17) Doctored Wounds - Heal
- (37) Doctored Wounds - Recharge
Level 4: Frost- (A) Positron's Blast - Accuracy/Damage
- (5) Positron's Blast - Damage/Endurance
- (5) Positron's Blast - Damage/Recharge
- (17) Positron's Blast - Damage/Range
- (33) Positron's Blast - Accuracy/Damage/Endurance
- (37) Detonation - Damage/Recharge
Level 6: Hurdle- (A) Jumping IO
Level 8: Unyielding- (A) Reactive Armor - Resistance/Endurance
- (9) Reactive Armor - Resistance/Recharge
- (9) Reactive Armor - Resistance/Endurance/Recharge
- (34) Reactive Armor - Resistance
Level 10: Taunt- (A) Mocking Beratement - Taunt
- (11) Mocking Beratement - Taunt/Recharge
- (34) Mocking Beratement - Taunt/Recharge/Range
- (36) Mocking Beratement - Accuracy/Recharge
- (42) Mocking Beratement - Taunt/Range
- (42) Mocking Beratement - Recharge
Level 12: Hasten- (A) Recharge Reduction IO
- (13) Recharge Reduction IO
- (13) Recharge Reduction IO
Level 14: Health- (A) Miracle - +Recovery
- (15) Numina's Convalescence - +Regeneration/+Recovery
Level 16: Resist Energies- (A) Reactive Armor - Resistance/Endurance
- (23) Reactive Armor - Resistance
- (36) Reactive Armor - Resistance/Recharge
- (43) Gladiator's Armor - TP Protection +3% Def (All)
Level 18: Invincibility- (A) Gift of the Ancients - Defense/Endurance
- (19) Gift of the Ancients - Defense/Recharge
- (19) Gift of the Ancients - Defense/Endurance/Recharge
- (27) Gift of the Ancients - Defense
Level 20: Stamina- (A) Performance Shifter - EndMod
- (21) Performance Shifter - EndMod/Recharge
- (21) Performance Shifter - EndMod/Accuracy
- (27) Performance Shifter - Chance for +End
Level 22: Ice Patch- (A) Recharge Reduction IO
- (23) Recharge Reduction IO
Level 24: Build Up- (A) Recharge Reduction IO
- (25) Adjusted Targeting - Recharge
- (25) Adjusted Targeting - To Hit Buff/Recharge
Level 26: Tough Hide- (A) Defense Buff IO
- (37) Defense Buff IO
- (40) Defense Buff IO
Level 28: Freezing Touch- (A) Kinetic Combat - Accuracy/Damage
- (29) Kinetic Combat - Damage/Endurance
- (29) Kinetic Combat - Damage/Recharge
- (31) Kinetic Combat - Damage/Endurance/Recharge
- (31) Basilisk's Gaze - Accuracy/Recharge
- (43) Crushing Impact - Accuracy/Damage/Recharge
Level 30: Super Speed- (A) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range
- (34) Blessing of the Zephyr - Run Speed, Jump, Flight Speed, Range/Endurance
Level 32: Unstoppable- (A) Reactive Armor - Resistance/Endurance/Recharge
- (36) Reactive Armor - Resistance/Recharge
- (40) Reactive Armor - Endurance/Recharge
Level 35: Boxing- (A) Kinetic Combat - Accuracy/Damage
- (42) Kinetic Combat - Damage/Endurance
- (46) Kinetic Combat - Damage/Recharge
- (50) Kinetic Combat - Damage/Endurance/Recharge
Level 38: Frozen Aura- (A) Eradication - Damage
- (39) Eradication - Accuracy/Recharge
- (39) Eradication - Accuracy/Damage/Endurance/Recharge
- (39) Cleaving Blow - Accuracy/Recharge
- (40) Cleaving Blow - Damage/Recharge
- (43) Cleaving Blow - Damage/Endurance
Level 41: Block of Ice- (A) Ghost Widow's Embrace - Accuracy/Hold/Recharge
Level 44: Ice Blast- (A) Thunderstrike - Accuracy/Damage
- (45) Thunderstrike - Damage/Endurance
- (45) Thunderstrike - Damage/Recharge
- (45) Thunderstrike - Accuracy/Damage/Recharge
- (46) Thunderstrike - Accuracy/Damage/Endurance
- (46) Thunderstrike - Damage/Endurance/Recharge
Level 47: Tough- (A) Reactive Armor - Resistance/Endurance
- (48) Reactive Armor - Resistance/Recharge
- (48) Reactive Armor - Resistance/Endurance/Recharge
- (48) Reactive Armor - Resistance
Level 49: Weave- (A) Defense Buff IO
- (50) Defense Buff IO
- (50) Gift of the Ancients - Defense/Endurance
------------Level 1: Brawl
- (A) Empty
Level 1: Sprint- (A) Empty
Level 2: Rest- (A) Empty
Level 1: GauntletI could use a little input on it, as I based the slotting on what knowledge I personally have and on Call_Me_Awesome's Invul guides (which are a real hidden gem on these forums, and they should be stickied in the tanker forums :P).
@Mazzo Grave
Webmaster Grave, Virtueverse!
Energy/Energy Blaster Guide