Reaper enhancements/XP per Point

The XP cost per Rank equals to 2,000 * (Level) - 1,000.

Cumulative XP equals to (total number of ranks) squared * 1,000 XP (so your 7th Survival Point costs a total of (7 * 7) * 1,000 XP, or 49,000 XP).

Unlike AP (enhancements), Reaper survival points are not capped at 80.

Milestones

 * To get a single capstone, you need 1,681,000 XP (41 * 41 * 1,000).
 * To get all three capstones, you need 15,129,000 XP (123 * 123 * 1,000).
 * Completely filling out Dread Adversary (54 points) requires 2,916,000 XP.
 * Completely filling out Dire Thaumaturge (44 points) requires 1,936,000 XP.
 * Completely filling out Grim Barricade (56 points) requires 3,136,000 XP.
 * Completely filling out all enhancements available at level 4 (36 points) requires 1,296,000 XP.
 * Completely filling out all enhancements available at level 10 (63 points) requires 3,969,000 XP.
 * Completely filling out all enhancements available at level 17 (89 points) requires 8,1000,000 XP.
 * Completely filling out all enhancements available at level 21 (122 points) requires 15,129,000 XP.
 * Completely filling out all enhancements available at level 27 (151 points) requires 23,104,000 XP.
 * Completely filling out all three trees (154 points) requires 23,716,000 XP.
 * Gaining access to the third Reaper vendor requires 5,625,000 XP, which will net you 75 points total.