Except for the item choice in the video, I agree on the build.  I think it may be pretty much the only viable hybrid buid and playstyle.

Regarding the items (I haven't played a hybrid build yet, mostly fire but this applies):

• Anklet is nice, but since pretty much all your combat is range based, you have enough time to position and don't really need all that much speed early. BoTF would provide much more surviviblity as HP is extremely important for any TB build.  The only map I still get Anklet on is Prison.
• Scaled Helm is extremely nice beggining item, but there is a catch.  You don't really need to use your abilities on creep waves early on.  Since you only need to do something like 1/3 of the damage on a creep and you will get the gold regadless of the source that killed it, you can farm perfectly well with auto-attack in most situations.  If you conserve your mana a bit better early on, it's quite feasible to go with Scalemail instead.  This gives you about 17% additional damage mitigation (for ~26% total, up from 9%).
• While speed is nice, you only really need it in bursts so replacing Boots of Speed with Wand of Speed works really well and gives you a lot more speed exactly when you need it.  It also leaves a slot open for another item.
  
• Hungarling's Crown is imho a bad choice.  For it's price you can get Vlemish + HoL which is a much much better choice.  Additionaly you can get it in stages, getting Vlemish first will give you a huge boost much earlier.  If you're trying to get away from HoL cause of it being changed, Vlemish + Plenor is still a much better choice for 3.250 gold less.
• I strongly disagree with waiting for expensive items - unless you're beeing fed (like you almost was in that video), you will be fighting a dowhill battle against DG that upgrade continuosly.  Nimoth and Unbreakable boots (which I think you got) imho are a a must as soon as possible.

Regarding Hungarling - just because the effect is not anywhere else doesn't mean it all that good (though your aura point stands).  But it's still a very very expensive item.

-25% cast cost = +25% mana pool and +25% regen (on top of all other regen bonuses).  Would you agree that it's worth 3.250 gold? Or rather would you pay 3.250 gold for an item that provides +25% mana and +25-40% mana regen aura.

Comparison of bonuses (did this to check it out myself).  I'm assuming 20mps 9 mps from permafrost.
Vlemish + Plenor vs Hungarling at level 20
2.625 mana (1.575+1.050) vs 1.987 mana (3.950+800)*25%+800 bonus (2187 with Ubreakable)
80,1 mps (9+12,43+11+4)*(1+70%+50%) vs 73,9 mps (9+12,43+18)*(1+50%)*(1+25%) with Fire Mark
61,9 mps vs 49,3 mps without Fire Mark

So Vlemish+Plenor is better mana bonus and regen rate than Hungarling period.  It takes 1 more slot but costs half the price.  Hungarling can get better the more mana items you stack, but I doubt it's viable to invest any more into mana items (though Hungarling would absoulutely rule on Inspirational Flame build).  Biggest advantage of Vlemish+Plenor combo is you can get it early and partially.  Once again, Aura point stands (the 4 mps aura of vlemish is not even close to competing - rough rating would be something like 1/5 the value).

EDIT: The actual mana regen and mana bonus on Hungarling will be different, the values given are the equivalent with the 25% ability cost reduction calculated in.

EDIT 2: found out the exact mana regen of Permafrost.

As I'm really interested in this buld and already started all the calculations, let's look into this too

At base cooldown
Frost Nova III - 1250 mana, 15s = 83 mps
Rain of Ice IV - 1100 mana, 14s = 78,5 mps
Deep Freeze IV - 725 mana, 15s = 48 mps
Fireball IV - 540 mana, 7s = 77 mps

Total = 287 mps.

Level 20 TB per this build, Vlemish + Plenor + Unbreakable
(Something like Groffling Warplate, Nimoth Chest Armor, Plenor Battlecrown, Unbreakable Boots, Vlemish Faceguard, Wand of Speed + Favor for the full build, avoiding HoL)
7375 mana + 80 mps regen

This would allow you 35 seconds of non stop casting in order to run your mana to 0.  It would need 92 seconds to fully regenerate.  Pretty decent if you ask me. Formula

Single volley of all spells = 3.615 mana.  You can fire almost 3 full volleys before running out of mana. 10.275 single target damage in just above 30s...

around 300 dps ability damage

EDIT: total theoretical maximums:

Pure Fire TB = 248 mps, 350 dps
Hybrid = 287 mps, 334 dps

Great guide! I've been wanting to learn how to play TB. I've got a helpful suggestion:

Wouldn't a Magnus Rod trinket work reallly well with this build? It also has a great passive mana regen ability. Plus, the Staff of Renewal also reduces the cooldown of Magnus Rod. On maps like Cataract you would have a really low cooldown due to the cooldown flag.

Straight 15% increase in both mana used (mps) and dps.  Offcourse those are all theoretical maximums, in practice it would be really hard to achieve them, except maybe in a single burst.

True about Ring of Fire, but neither will deep freeze always hit for maximum.  You will often need to use it as important instant interrupt instead of damage.  Ring of Fire is 150dps itself.

Fire Nova III is 53 dps, 91,6 mps.  It's very inneficient in terms of mana and also requires you to be in the middle of things.  Don't think it has much synergy with the ranged nature of the hybrid.

BTW I'm not sure how the cooldown and casting time work, cant check atm.  Maybe we should add the casting time to the cooldown which would reduce the dps and mps a bit.

This is close to what I already do, except I would trade off one level of Frost Nova for Fire Nova, it will give me an extra spell to work with so I'm not such a slave to cooldowns.

For sure, but that's part of the challenge. If you can stay aware you will never die so once you get to 15 or so HoL is less of an advantage.

wrong sorry. If you want to 1v1 or 2v2 ill prove you wrong..HoL stays viable until the end of the game.

HOL will get nerfed 1.1.

Yes because getting All Father's Ring definitely implies that the game is serious... I wish I could take casual games as serious as you, must be a real thrill to beat someone 50-5 rather than 20-5.

Excellent guide Ferminal. I play a very similar build but in different order but I will definitely give this a try.  + 1 Karma for the guide and the way you have dealt with that childish kid Foreshadowed.  Some people have no manners.

now he's entered the penis measuring contest stage in which he tries to challenge people to 1on1 games, under the principle that a victory in game gives him unlimited bragging rights and instant respect.