If the sledgehammer of the Guard doesn't work and the scalpel of the Space Marines isn't to hand, try a subtle needle courtesy of an Assassin.
Available to the Lord Solar for this Crusade are one of the original Rogue Trader Assassins and still a favourite figure of mine.
Moving on, there is a 2nd Edition Vindicare.
The Assassins were revamped when switched to plastic and became suitable impressive with a Culexus and a supercharged Eversor.
Finally, sporting his own sniper spot is the Warhammer+ exclusive Vindicare.