I suppose you mainly used beams as attack spells?
Yeah, those are bad.
To defend against the M16A1 simply cast an armour?
To do this you simply have to press E+D+[middle mouse button].
It'll give you immunity to arcane, lightning and physical damage. Note: M16A1 does physical damage.
What kind of creatures did he summon? Trees or undead?
To kill the treespirit simply cast EFDF. That's a burning stone wall, which will keep it busy.
Against undead creatures, simply area-cast QWER, if that doesn't work shoot a stone (DDDDD force-cast). Don't charge it though.
Now to the spells you should use to successfully annihilite your opponent.
Beams are lame! Do NOT use them in PvP!
Aiming is hard, damage is low and they can easily be avoided.
Use spells with shield in it (E)!
Those spells can be walls, mines and storms; armours and auras.
Read this: http://steamcommunity.com/sharedfiles/filedetails/?id=118999253#5931
Now some tactics:
First off, never run around unprotected, use armours or auras for immunities to diverse elements.
Read this: http://steamcommunity.com/sharedfiles/filedetails/?id=118999253#5567
Try using QEDQQ and ERDRR enchants to freeze your totally unfair playing opponent.
Then cast EARAR for awesome lightning damage and to keep him frozen.
Another nice method, less tactic but just brute force:
Cast QSDF and SDR alternately.
For doing this you have press the keys at the same time.
http://youtu.be/RyfBRruBdR0?t=6m
Or combine both tactics and do a quick QSDF + SDR volley to freeze him quickly, then cast EARAR (enchant) to keep them frozen and then spam only QSDF.
Don't forget to recast the EARAR thingy when it vanishes.
For more information about spells, the combat system and PvP, read the guide I linked above twice.
The game is balanced. [removed].