New troop that targets town halls
A lot of attacks in wars have clever ways of keeping troops from targeting the town hall. If there's new troops out there that will automatically go for the town hall, it can add a new dynamic to war battles. They would have low speed and health making them vulnerable to spring traps and bombs. I'd give them a low housing space (1 or 2) with an attack at around the same area as an archer. People can drop a bunch of these units hoping they reach the town hall without finding any traps along the way or use them with golems and other meat shields to distract defences long enough for them to do their job.
