So I got Dagan last night, and here are my quick and dirty numbers:
(for this test)
These are the numbers that I got (each test done twice cuz I R tired):
HP returned: 241
MP returned: 150
HP returned: 362
MP returned: 220
HP returned: 571
MP returned: 350
The MP returned seemed really odd to me, but I ran the second check just to make sure. I did a single test at 300% with more hp and mp gear on and I received greater returns. I'll do some more tests since the numbers seem funky, but if any of you have particular TP%'s you'd like me to do then please let me know.
And a few final notes:
It is not AoE
It is similar to starlight in that you do not hit the enemy with the weaponskill, and using it does not agro the monster (you just have to be within range to /attack it).
I am apparently the LS hippy now.