You still need to be able to deal with:
- Heavies
- Infantry
- High ARM
- High DEF
Mostly though you are trying to ask your opponent a question. If you are making things difficult to kill they need to be as difficult to kill as possible. If you are going for a swarm of something it needs to be as big as possible. Go for overkill, an ARM 22 Galleon is probably going to be very difficult to kill but an ARM 24 Galleon is going to be impossible for most armies and that's what your skew list needs to aim for.
Example
Trollbloods
Standard Army
PCs: 50 / 50
17 models
[00] Madrak Ironhide, Thornwood Chieftain (0 / 6 WB)
[12] >> Mulg the Ancient
[10] >> Earthborn Dire Troll
[10] >> Dire Troll Bomber
[09] >> Dire Troll Mauler
[06] >> Troll Axer
[03] Janissa Stonetide
[02] Troll Whelps
[03] Krielstone Bearer & Stone Scribes (3 grunts)
[01] >> Stone Scribe Elder
Madrak has sure foot so a model and all models within 3" get +2 DEF. The earthborn animus gives me +2 ARM when in 3" of a wall and Janissa gives me a wall that I can place wherever I want. The wall also gives me cover against shooting (another +4 DEF) and +2 DEF if you are striking me in melee over the obstacle. The Krielstone gives me another +2 ARM and I end up with 4 heavies on anywhere between DEF 14 and 18, ARM 22 or 23, with whelps, snacking and regeneration to heal them back up. The Bomber and Axer kill infantry and I have two big AOEs so high DEF isn't a big problem. The Mauler has a great strength buff as do the stones and the Earthborn and Mulg are high P+S to start with. Madrak's feat allows models to move an inch and attack again for free whenever they kill a model and he can give them +2 to hit. The only real problem with the list is that I can't get elemental communication on the Axer so it is only ARM 20. Poor little Axer, he never gets any love, he doesn't even have a chicken.
There aren't a lot of armies that can deal with 4 ARM 22 or higher heavies, particularly when they also have to contend with mostly DEF 16 and also need reach to attack at least two of the beasts in melee. Of course if your opponent has enough buffs to get over that hurdle then you have 4 slow beasts, only one of which has reach and they only need to remove 5 models to defeat the list. A good example of a counter to this list is Kreoss1. Purification lowers all your ARM by 2 (except on the earthborn) and gets rid of sure foot (lowers DEF by 2 and can be knocked down). You can then use your knockdown feat to shoot Madrak or just beat a few heavies out of the game with your choir buffs.
Standard Army
PCs: 50 / 50
17 models
[00] Madrak Ironhide, Thornwood Chieftain (0 / 6 WB)
[12] >> Mulg the Ancient
[10] >> Earthborn Dire Troll
[10] >> Dire Troll Bomber
[09] >> Dire Troll Mauler
[06] >> Troll Axer
[03] Janissa Stonetide
[02] Troll Whelps
[03] Krielstone Bearer & Stone Scribes (3 grunts)
[01] >> Stone Scribe Elder
Madrak has sure foot so a model and all models within 3" get +2 DEF. The earthborn animus gives me +2 ARM when in 3" of a wall and Janissa gives me a wall that I can place wherever I want. The wall also gives me cover against shooting (another +4 DEF) and +2 DEF if you are striking me in melee over the obstacle. The Krielstone gives me another +2 ARM and I end up with 4 heavies on anywhere between DEF 14 and 18, ARM 22 or 23, with whelps, snacking and regeneration to heal them back up. The Bomber and Axer kill infantry and I have two big AOEs so high DEF isn't a big problem. The Mauler has a great strength buff as do the stones and the Earthborn and Mulg are high P+S to start with. Madrak's feat allows models to move an inch and attack again for free whenever they kill a model and he can give them +2 to hit. The only real problem with the list is that I can't get elemental communication on the Axer so it is only ARM 20. Poor little Axer, he never gets any love, he doesn't even have a chicken.
There aren't a lot of armies that can deal with 4 ARM 22 or higher heavies, particularly when they also have to contend with mostly DEF 16 and also need reach to attack at least two of the beasts in melee. Of course if your opponent has enough buffs to get over that hurdle then you have 4 slow beasts, only one of which has reach and they only need to remove 5 models to defeat the list. A good example of a counter to this list is Kreoss1. Purification lowers all your ARM by 2 (except on the earthborn) and gets rid of sure foot (lowers DEF by 2 and can be knocked down). You can then use your knockdown feat to shoot Madrak or just beat a few heavies out of the game with your choir buffs.