This task is not completed by your hero reaching Paragon level 450.
This task requires you to spend 450 Paragon points.
There are six standard Paragon trees…
- Vanquisher / Gladiator / Survivor / Brawler / Slinger / Harbinger
Each of those trees cost…
- 4 points to activate each node, which is 60 points in total per tree of 15 nodes
This means that activating all of the standard nodes requires spending 360 points.
Assuming you are Paragon 450, this leaves you with 90 points to be allocated.
There are three legendary nodes…
- Benefactor / Lightning Rod / Roaring Strike
Each of those nodes cost…
- 80 points per skill
If you have activated all of the standard tree nodes and one legendary node, that’s 440 points allocated.
This leaves you with 10 points unallocated.
To complete this task, your hero will need to be Paragon level 452.
With all standard nodes, and one legendry allocated, you will have 12 unallocated points remaining.
You need to de-allocate enough nodes in the standard trees so that you recover 68 points, i.e. 17 standard nodes…
This leaves you with the 12 you had and the 68 recovered points, i.e. 80 points.
Allocate those 80 points to a second legendary skill.
This will mean you have allocated 452 paragon points and the task will complete.
You can then de-allocate the legendary node, and re-allocate the points to the standard nodes.