Morley describes this point in his paper: Orthocentric properties of the Plane n-line (Ref-49).

The range of points nL-e-P1 in a 4-Line, 6-Line, 8-Line, 10-Line will be resp. 4L-n-p1, 6L-n-p2, 8L-n-p3, 10L-n-p4, etc.. See nL-n-pi points.
Schematically it shows (note the use of lower cases in items p0, p1, etc.):
In a 4-Line:
The Circumcenter of the 4 points 3L-n-p0 is 4L-n-p0. = 4L-n-P3
The Centroid of the 4 points 3L-n-p0 is 4L-n-g0.
The Ratiopoint 4L-n-p0.4L-n-g0 (4:-3) is 4L-n-p1. = 4L-n-P7 = 4L-e-P1
In a 6-Line:
The Circumcenter of the 6 points 5L-n-p0 is 6L-n-p0. = 6L-n-P3
The Centroid of the 6 points 5L-n-p0 is 6L-n-g0.
The Ratiopoint 6L-n-p0.6L-n-g0 (6:-5) is 6L-n-p1. = 6L-n-P7
The Centroid of the 6 points 5L-n-p1 is 6L-n-g1.
The Ratiopoint 6L-n-p1.6L-n-g1 (6:-4) is 6L-n-p2. = 6L-e-P1
In a 8-Line:
The Circumcenter of the 8 points 7L-n-p0 is 8L-n-p0. = 8L-n-P3
The Centroid of the 8 points 7L-n-p0 is 8L-n-g0.
The Ratiopoint 8L-n-p0.8L-n-g0 (8:-7) is 8L-n-p1. = 8L-n-P7
The Centroid of the 8 points 7L-n-p1 is 8L-n-g1.
The Ratiopoint 8L-n-p1.8L-n-g1 (8:-6) is 8L-n-p2.
The Centroid of the 8 points 7L-n-p2 is 8L-n-g2.
The Ratiopoint 8L-n-p2.8L-n-g2 (8:-5) is 8L-n-p3. = 8L-e-P1
Etc.

Example of nL-e-P1 in a 4-Line: Example of nL-e-P1 in a 6-Line: Example of nL-e-P1 in a 6-Line,
where incidentally 6L-e-P1 is the common point of the perpendicular bisectors of all 6 occurrences of 5L-o-P1_i.5L-n-P7_i (i=1, … , 6). Correspondence with ETC/EQF:
When n=4, then nL-e-P1 = QL-P3.
Properties:
nL-e-P1 can be constructed as the common point of the perpendicular bisectors (Level-up Construction nL-n-Luc2) of (n-1)L-o-P1. (n-1)L-n-pk, where m=n-1, k=(n-4)/2. See nL-n-pi points.
nL-e-P1 can be constructed as the common point of the perpendicular bisectors (Level-up Construction nL-n-Luc2) of (n-1)L-n-ph. (n-1)L-n-pk, where m=n-1, h=(n-2)/2, k=(n-4)/2. See nL-n-pi points.