Originally Posted by
CThruTheEgo
Here is a summary of what I would like to see the level 18 and 20 cores become. Note that not all are my idea, just consolidating and reiterating what I like best so far.
Lethality: on vorpal, perform an assassinate using the assassinate DC. On failed save, target is killed instantly. On successful save, target takes 10d6 additional sneak attack damage.
Deadly shadow: +4 int, +1 assassinate DC, +4d6 sneak attack damage, 10 melee power.
Note that lethality's additional damage on a failed save comes out to be an average of 1.75 damage per hit, which is a negligible amount. On a successful save, which should be most of the time for a well built assassin, this effectively preserves and scales the ability into epic content.