you can enhance it by the blacksmiths
dranaloth and trainers
there are no pet shops in swordhaven
hes at swordhaven
If by "Blue Axe" you're talknig about the Swordhaven Axe that's blueish color and has the Swordhaven symbol on it (in blue), then you can get it in the "good Shop" in the castle.
in the swordhaven castle downstairs and upstairs
from swordhaven castle good shop
You cannot get Artix's golden axe on aqw but it will be realeased soon in doomwood along with necromancer (not at the same time). Before though you could get a silver axe but it is rare now.
You must kill slimes. Slimes can be found in Newbie (/join newbie), Greenguard West (/join greenguardwest), Cellar (/join cellar), Swordhaven (/join swordhaven) or Swordhaven - undead (/join swordhavenundead).
the best enhancement is armor and helm fighter then the others luck enhancement
luck is an enhancement you can get from cysero (yulgar)
if you are evil you have to go to the king of swordhaven and if your evil you will have to do the same but to the Queen of Skullholme.
im pretty sure that they are in swordhaven(while it's on fire or burning)
healer or luck -dravenred