i stuck at stages with enemy hp 50+. i'm currently lvl 45 and none of my gems hurt or kill any enemy anymore.
i've done all other stages so far, all skills to the max (rank9), all sockets full with mostly mana at start and mana based on lvl.
i've got about 700 mana to start, but nothing i'm able to build works. 2 grade 2 won't hurt any enemy. 1 grade 3 hurts, but don't kills. a combined of two grade 2 or 4 grade 1 also won't do anything. i always die at round 1
dont max all skills only max mana multiplier + gem cost + pure/dual/triple/quad skill. the rest will become skill points you can use to get better gems.
Agreed with the above. Dont spend all your skill points. Save as much as you can for the extra mana. Also go back to prior maps and increased the xp gained so you can further increase your level.
As an extra tip for spending skill points, only assign them in multiples of three. If your cap is 11 points in any particular skill, just put 9 in. This will save you a bunch of points and help your starting mana, without losing you much at all in the way of skill effectiveness.