Playing the Imperial Guard campaign of Retribution. One of my four characters is relatively mundane, a mere sergeant with a penchant for not dying. He can sneak around Catachan-style, but he's basically just a tough dude with a plasma rifle.
Then we found a freakin lascannon. A tripod-mounted monstrosity as tall as him, with massive blast shield. This thing is basically an anti-materiel sniper rifle... emplacement. It's 100% effective against all armor types (most anti-armor weapons are "weak" against infantry- the lascannon cares not). It takes time to set up, and the fire rate is abysmal, but it's glorious to see it blow chunks off dreadnoughts and tanks. Even chaos space marines fall to its beams, which generally come from offscreen. It's wasted on basic infantry, since it targets one at a time, but it's worth it to watch them gib. I didn't know that was a thing.
I just got an upgrade which lets him skip the lengthy setup process. Now he doesn't even need to set up ahead of time, he basically swings this emplacement like an assault rifle. This is like Master Chief carrying around a stationary turret, except he's just some unaugmented human in a vest. Freakin Catachans.
I can't take much credit for this, but my team *is* owning.
WH40K DoW2 Retribution