I *love* armour of earth for people wanting defence as one can keep it up all the time (lasts 30 seconds, recharge 15), but am really not very keen on magnetic aura unless you really know what you want it for.
That's because even though magnetic aura will help dodge at 75%, that applies only to *melee* attacks, it only lasts for 10 seconds at skill 12 (7 at 5) and it has a terrible recharge time of 60 seconds.
There are far better ways for an earth ele to dodge attacks such as either eruption or ward vs melee.
It's an OK skill for the purpose you have in mind, but I still think that there are better options out there, such as eruption which would both deliver damage and (after 5 seconds) blind your foes for a little while, which also prevents them from damaging your teammates.
As for skills in general, I would pick 2 out of the 3 skill lines earth, fire and smite. *Definitely* take some energy storage, but don't overdo it unless you're going for an ether renewal build or the like.
As for the PBAOE thing, you *need* the protection. The only downside is that earth doesn't start to get most of its decent damage spells (other than eruption) till later in the game. I think it's either in or after the jungle that you get earthquake and aftershock.
For the early game, fire does do well, especially in the north shiverpeaks, where most enemies are vulnerable to fire. Later on you can use your refund points to switch skill lines.
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