I would recommend to buy dark power first. On 4/4 it gives 15% more dmg for 40 seconds. With my 15% cd its only 9 seconds before I can use it again. My base dmg is 500 with dark power its 575 And remember also shaman and other party members get more dmg ;)
on top i use rage weapon (10% more dmg) 9,9 % chance to activate with rage crystal on armor. Also i use dmg incrrase relic on heal ;) sometimes i make it 700+ dmg if all kicks in. I d say 40-60% of time i have 630+ dmg (500 base dmg)
Next expert skills depends on weather you go for pvp or pve. But my build suits both quite well, still is more pve:
Acid rain is an awesome stun. If you use fateful connection after acid rain, the mobs will seem to stay still. Get panic for 1-2 mobs who aren t caught in the rain.
heal 5 shield 5 nightmare 3
dark power 4 Panic 2
acid rain 1 poison shield 1 and fatefull connection 1
you might switch fateful connection with mental pit for pvp and maybe max panic.
with my skillbuild snake is not in hotkeys and all hotkeys used with skills