Which one should i level up 1st cuz I have very limited fame for now...
Lavanica or Zephyrica
and plz Tell me about their builds... useful modes and weakness....
According to this thread Zeph:
[Chat (Android)] Top 10 heroes & builds
as for Lava:
[Off-Topic] Lavanica-finally f2p get to test and use Lava
[Chat (Android)] Lava build
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If your goal is to get great scores in guild wars. Then lazu. If you want a hero killer then zyph.
If you have a dove that you use doom balloon with then I recommend going lazu with revive 9 and revite 5+.
Zypherica is the better hero though.
From those 2 i would pick Zephy without any doubts.
As for builds there are many different, i am using FG/Empower, but you can use FG/Survival for example. Enchancement depend on what you want to achieve, i am for example using SI but you can use offensive talent of HR to regain health.
Modes ?? I say every mode.