I know about the Crypt Lord TR I started doing that years ago when no one else was, works good just gotta be sneaky when you start it and tech for Statues and possibly web to seal the deal.
I specificly said "competitive" edges, base camping ain't gonna get you a win, no hero levels no win.
VS undead I like to get Drow Ranger & fiends creep her to level 2 with Dark Shot(or whatever its called) then get Silence, and push. Killing their units is easy when their DK is silenced. and snowballing with dark shot.
VS orc: Years ago I developed a strat using DK & Pit Lord(Howl) Fiends+banshees. I don't like getting Statues in this matchup anymore cuz BM can easily feed off them, insted using Armor Scroll
VS elf: best race to CL tower rush or Ghoul rush
VS human: Dread Lord harrass and carrion swarm when the call to arms murders their economy.
QQ: don't know where to ask so I'm gonna ask here. Does the Pit Lords cleave damage life steal off of Unholy Aura?