I feel your pain, starting as a wizard can be hard and slow. Here's my two cents:
2. Settle on a good mainhand weapon. Your first priority. I think sword and staff are better picks at low levels because of their AoE that doesn't diminish.
Once decided, make sure the sword you choose to stick with has %damage on it - this is the most important modifier on a weapon in 1.3.2.
The rest of your gear should give you a good spread of damage stats and tankiness (think HP /crit chance / crit damage). To achieve this, its very important that you use a good find and begin enchanting.
Enchanting is very worth it - it adds stats to already good items. Once you have a good item with +HP, for example, add on more stats so you can keep it and maybe get some damage modifiers as well. More importantly, the ‘reroll button’ allows you to ‘level up’ those gears you have already enchanted.
It’s actually a better idea to go with lower Enemy Power (2 mayne) until you get lucky with drops…don’t worry about luck right now - your focus should be on levelling up and clearing floors.
Use an offhand that suits you to help keep you alive. I find the Tome and Orb to be useful in these cases. (If you have a Tome and a Legion hat, you can have an army of about 5-20 minions, and you can sacrifice them to heal yourself.)
Finally on talents, go to the character screen, stats page, then click the third tab. This page shows you what talents you currently have and their rank (and respective effect, for that rank). Those greyed out are talents you do NOT have.
Now as for where to get them, one main source is from your armor - each piece of armor has that little wording beneath its name that says what talent it gives. The max is 19 (will be 20 soon) - and the higher the level of the armor, the more talent points it gives.
Talents can also be a stat, though this is very rare! For example, an item could have +2 Magnify and that would increase my AoE by a little bit. If I had a ring that already gave 6 Magnify, I would have 8 Magnify in total now.
There are also enchants that go +x All Spiritmancer, for example. These add x to all ‘unlocked’ talents in the Spiritmancer tree (the best way to figure it all out is to scroll around the talents page.)
So to sum up, pick a good weapon, upgrade that, and talents and armor to support your damage output.
Keep the questions coming!
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