It has been patched since start of iCBT2. Right now it is a party buff that gives +1 to skill levels for x skill usages where x is Divine might’s level. Its old mechanic was way too OP.
Thanks. So at this point there is no need to spend more than 1 point in that. Or none at all. Pretty harsh nerf though
But now it’s a party buff, so still a great skill worth maxing, unless you are playing solo. Even for solo it’s worth it for 2 more heal tiles, etc.
I went ahead and tested it today, and 1 skill Divine Might does NOT buff is…Divine Might. Just thought I’d throw that out there because I was thinking about casting it twice in a row to get 1 extra skill use out of it. O well!! 
I dont understand why spend more than one point in it.
I havve heal lvl 7. When I used it, it went to lvl 8, even though divine might is lvl 4.
Now, if I use it again after it’s CD but before the buff expires, it doesnt add an extra level.
I plan on putting 5 levels into it, because that will buff the next 5 skills you use by 1 level. Since this is a party buff, I’m sure everyone you play with could appreciate the those extra levels on multiple casts. This is also especially useful to cast right before everyone in your party applies their buff skills, particularly if 1 person has more than 1 buff they can cast