What about:
+ Necron Monoliths (Gravity Pulse - not ideal, but huge diameter)
+ IG LasCannon or Missile Squads with Ignores Cover Orders
+ Eldar Wraithguard with D-Scythes (Template D-Weapon)
+ Flamestorm Cannons on Land Raiders / Relic Preds (Template S6 AP3)
+ Daemons - Plague Psychic - Rancid Visitations (Nova T-test, no Armor or Cover Saves)
+ Daemons - Excess Psychic - Pavane (Cascading Ld-test, no Armor or Cover Saves)
+ Daemons - Plague Psychic - Choir (Nova Ld-test, no Armor or Cover Saves)
+ Daemons - Masque - Dance of Death
+ IA Daemons - Mamon - Contagion Spray (Template, Poison 2+, AP3)
+ IA Daemons - Plague Hulk - Rancid Vomit (Template, Poison 3+, AP3)
+ IA Daemons - Greater Brass Scorpion - Soulburner Cannon (S6 AP2 Large Blast, Ignores Cover)
+ Aquila Strongpoints
+ Eldar Wraithknight / Hemlock D-Weapons (6 on D-Table allows no saves)
+ Aquila Strongpoints (6 on D-Table)
+ Any Super Heavy Stomp (6 on Stomp-Table)
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