They were nerfed by half because they were far too powerful in lvl 30 den, but they are still useful in lvl 50 den even with that nerf

if you are going to invest in it at all then dont bother with only 2 points, with 1 extra point you double its stat gain from 6 to 12, that alone will not let you live through an LB, a combination of that, food and your character stat allocations, will allow you to survive LBs