Ok, so since the beginng of 5th edition there has been a rise of a particular type of unit. The concept is to take an expensive unit with a lot of dudes (relativaly speaking), give it upgrades, attach an character or two, and hit what ever you can. I am of course refering to the death-star unit.
Now I know a lot of competative players do not like this sort of unit, because it falls under the All Your Eggs In One Basket syndrome, but I would like to say that death-star can work. There are a couple of reasons for this.
First off I would like to state that not every deathstar will work and using them requires more than just a point and click attittude. So with this in mind I will list the criterien that I believe will make a good death-star. First you need a large and imposing threat bubble, either by powerful range weapons or by large moblity. This ensures that your oppent can not just maneuver around your large and expensive unit. Second you need durablity, it is not usally a good thing to have 500 points sunk with one battle cannon shot. Finally, and this should be obivous, but your unit needs combat punch.
So why does this sort unit work? Well it forces your oppenent to commit a large portion of their army to deal with one unit or risk losing a lot of their own force. How can one unit created enough havoc to justify an outrages point cost? There are a couple of ways. Multi-assult is one your biggest assets and will often show the true potential of a death-star unit. Also remeber that independent characters are, well, independent, Mmeaning that those expansive wolf-lords can break off of and do their own thing as your thunder-wolves eat a rhino. Also rember that range weapon punch is a very valuable asset as a death star is a hard to destroy platform, In genral just remeber that expanding the role of the death-star will help make it more viable and force your oppnent to deal with it quickly.