Buy a scroll. For me personally scrolls started dropping in LS every now and then. Another way is to follow a higher lvl into the SeG gate and try to be quicker at going through it as them. Once in SeG it's fairly easy to avoid mobs nowadays and when in Uru it doesn't really matter if you die cos you'll respawn in Uru anyways.
simple. ride ur hobby horse to collapsed prison, got to the scaffold execution ground, then go uruga. use ur hp stone once after going set cuz the vivi is ranged...