How the Hel

(this build also works for arenas just dont get the vampiric shroud or potions
-Once you get to your lane you need to be more passive until at least level 3 and you have all of your abilities.
-Your one is your primary poke if you can directly hit the god do it, but otherwise try to take advantage of the AoE and hit the minions near him.
-Occasionally hit him with a night 2,3 combo if the opportunity presents.
-Early game is about poking down and making the god worry about how you're going to attack (whether its the 1 or 3 of night)

-After you get your 4 you want to stay in day stance whenever you don't need your damaging abilities to take advantage of the extra mana regen.
-If you can this is where you start to roam.
-Once team fighting starts keep an eye on your team. The AoE heal can be the difference between winning or losing that fight.
-Don't be afraid to do damage though whenever the heal is on CD late game with this build your damage will go through the roof.

-If your team is winning I recommend no defensive items go for pure magical power.
-Try to stay with your team at this point as stated earlier your heal can turn a team fight

Tips
-Get used to switching stances in combat once you have full CDR your CDs are quite low.
-Remember to stay in day stance when not in combat or low on mana(Mana regen should hit 100 in day at lvl 20)
-Don't be afraid run in and hit them with everything toss your heal and run.
-The day 2 ability breaks any CC and makes them immune for up to a second.
-Leveling the 1 and 3 together works best if you combine all your abilities effectively

Pros
-High damage and healing
-Great team support late game
-Can turn a team fight if you hit at the right time

Cons
-Low health if you go pure damage
-Minimal team impact in early game
-If you have to go defensive items your effectiveness is reduced
-Requires constant stance switching
-Early/mid game needs you to hit with multiple abilities to do a good damage