I have completed the game once with a mage
and now I want to try out a warrior..which of course is going to be much harder because..he is not a mage.. [yet

My idea was to make myself a very powerfull sword, because I saw alchemy recepies for adding cold, fire, poison damage, but I need someone to clearify to me how it works exactly as far as game mechanics allow:
I already tested that I can add +1 damage at alchemy lvl 5 , I got very excited because I thought I can add more damage indefinetely as long as I can afford the reagents, but to my joy turned into magic dust [along with the sword] when I tried to add the same +1 damage again

So what are the maximum I can add? Is it +1 of every element [cold, fire etc.] or do I only get to choose one bonus enchantment for the weapon?
or is it +3 max at very high levels of alchemy?
Thanks in advance for any info =]
Some other notes that may be helpfull to others after my first playthrough:
You can make a decent amount of money my selling food you create via spell [Thank you Capt. Obvious]. At Divine magic 11 you can cast lvl6 Create food and get dry meat which is worth 15 so sells for 7gold easily. Just keep spamming the spell/rest untill you get like a 100 dry meat [if you can carry that much

and there you go: 700gold + gold made from fish/bread/potatos.
Time consuming - yes, but it is a infinite gold mine if you are patient.
A very simple way of getting to the K..something..Port city, if you don't have the citizen papers or you are not insane to pay 2000gold,
is to buy a lvl 1 potion of invisibility [very cheap] and flip the gate switch yourself.