Generic - Basic Build that is safe for most situations.

% Damage Bruiser - Now that Burn the Impure does 2.5% per mark used, this is a scary build. The build mainly works, and should be used against, any team with with more than 1 bulky target. 2.5% * 3 marks = 7.5% max HP damage excluding base attack damage and mark's baseline increases.

Impale-rius - if there are 4 or 5 people at the mid fight go this build and try to complete Impaling Light. Helps a lot when you are the only initiator or the enemy team has a hero you need to pin down. This isn't a good build, but is a fun one.

Solo-Tank - When you end up as the only tank for whatever reason this build works fine. Level 4 changes based on other team. If Butcher or Smash Varian go Bulwark of Flame. If Jaina or Arthas go Unshakable Faith. Additionally, if you have been relatively healthy throughout the game, you can opt to choose Heavenly Host over Impervious at level 20.

All builds but % Damage can take Unshakable Faith if there is a hero with heavy slows or roots on the enemy team, such as Jaina or Arthas. Maybe even against an Alexstrasza or Malfurion. Experiment a bit.