Warforged Barbarian|Battlemind/Winter Fury - infinite damage available at level 15

[GPuzzle]

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Race: Warforged
Class: Barbarian|Battlemind
Hybrid Talent: Rageblood Vigor
Paragon Path: Winter Fury
Multiclass: Fighter

Strength 22
Constitution 22
Dexteritry 14
Intelligence 9
Wisdom 12
Charisma 11

Feats
L1-Chainmail Armor Proficiency
L2-Scale Armor Proficiency
L4-Gouge Proficiency
L6-Spear Expertise
L8-Weapon Focus (retrained to Icy Heart at level 11)
L10-Wintertouched
L11-Lasting Frost
L12-Hybrid Talent (Rageblood Vigor)
L14-Improved Defenses

At-Will
L1-Howling Strike

Daily
L15-Mind Blade

Items
+3 Rending Gouge

Mind Blade applies Unconcious. Whenever you hit someone who's unconcious, every attack against them is a crit. Therefore, we do get the MBA from the Rending Gouge. But that MBA will be a crit too, so we'll attack again. And again. And again.

"But GPuzzle, can't we only make one free action attack a round?"

Rending just says you make it, it's not marked as a free action.

So we end up attacking again. And again. And again. And again. Forever and ever and ever.

And we are dealing infinite damage.

[NightScar]

to auto-crit an unconscious creature you must perform a coup de grace, which is a standard action.

[GPuzzle]

Ah, crap. That breakes the build completely.

[Yakk]

It is as much a 'no action' attack as it is a minor, move or standard action attack. All bonus attacks are free actions or more unless explicitly something else. Don't be silly.

[Sol]

Instead of posting fully fleshed out, named builds with crazy mechanical tricks that often don't work the way you want, you could just post asking if the core mechanical trick involved works ;) might save time.

[Tegu8788]

That would be a wise idea. Theorycrafting in it's own right is fun, but this isn't the pointless-optimization-using-lose-rules forum. That's what WotC is for.

[darkdragoon]

It is as much a 'no action' attack as it is a minor, move or standard action attack. All bonus attacks are free actions or more unless explicitly something else. Don't be silly.

No Action attacks exist, most notably Power Strike.

[Sol]

No Action attacks exist, most notably Power Strike.

No action attacks specify that they are no action attacks.

The RC clarifies that bonus or granted attacks that fail to specify an action type are to be considered free actions.

[Silma]

No Action attacks exist, most notably Power Strike.

Power Strike is not at attack by itself though, it is an enhancement to a basic attack

[masteraleph]

Power Strike is not at attack by itself though, it is an enhancement to a basic attack

Power Strike is a no action attack power. But it does not make an actual attack.

[Yakk]

No Action attacks exist, most notably Power Strike.

Yes. And it says "no action" (or rather, there is explicit errata saying it is a no action attack).

I said interpreting a power that does not say what action it takes as a "no action" is no more valid than interpreting it as a standard action, move action, or minor action (or free action).

By RAW, it does not have an action type, so you cannot do the action.

By RAI, it should be a free action attack.

[darkdragoon]

That's all well and good, but Rending is a property, not a power. A property that modifies the usage of the attack power "Melee Basic Attack."

Honestly, it's very close to a Timmy enchantment.