What's stats/skills should I spend my points on for mage?
INT for much greater damage, but much higher Mana cost. A little bit of extra Mana.
WIS for greater Mana total as well as greartly reduced Mana cost, but not as much damage boost.
Basically choose between massive damage which can be wielded very few times before running out of Mana or having a huge amount of Mana, but having to use more spells to defeat foes.
Personally, I prefer wisdom since greater mana total also increases mana regeneration quite a bit.
Also, accessories with Arcane prefix increase base mana before taking into consideration stat multiplier...
Ex:
Base mana x multiplier = total mana
(Base Mana + Extra Mana) x multiplier = A LOT MORE MANA
Same goes for Defense, Offense, Speed, etc... But only Manaand Defense have massively obvious applications.
For skills, the one that increases mana is infinitely more useful than the one that increases damage by a specific amount, but you need that second one leveled in order to get access to active skills.
Amount the active skills, water shield is good for taking 5 hits, which might be useful as additional defense which might be necessary considering the low defenses of images.
There's a fireball which launches MULTIPLE fireballsper cast, with the number increasing by skill level. There's a delay between each fireball, but they only cost one usage worth's of mana. This can help you deal continuous damage to a single foe or deal attacks to multiple foes for low mana cost. Useful at the beginning, loses effectiveness when you get high class magic weapons.
There's also one that mimics the vilethorn, HOWEVER you should turn off auto aim in order for the thorn to attack in the direction you are actually pointing at... Useful since its stronger than the vilethorn and doesn't use an inventory slot and attacks through walls.
The other useful skill is an earthquake thansends earthbound enemies flying! Useful against zombies, slimes, skeletons etc... Useless against demon eyes, bats, worms, and any flying creature... Useful when surrounded early game to run away, but very particular usage outside of that.