fusion powered relativistic quantum railgun that fires depleted uranium flechettes at 0.1% of the speed of light directly forward into the current and adjacent 256-worldlines so that it still hits the target if they are equipped with temporal armor or jump into another dimension
to escape being hit by this you'd need to jump several hundred worldlines across. this is possible but the world divergence can become pretty high on such big jumps so you might encounter strangeness
banks of supercomputers below deck calculating the worldshifts