Stats:
-HP: 80
-ATK: 4
-DEF: 3
-SPD: 1.60
-MAG: 1
-RES: 1
-ACC: 50%

Skills:
-SWORD SLASH: 0.50sec cooldown (wide crescent swing, 100% ATK dmg + 15% per level)
-MULTI CLEAVE: 12sec cooldown (multiple slashes in area, 50% ATK dmg + 30% per level)
-MEGA SWORDS: 10sec cooldown (throw huge swords, 50% ATK and 100% MAG dmg + 20% and 40% per level)




Gameplay Tips:
-max Multi Cleave, it attacks all enemies within the range and hits more than once
-keep DEF and ATK more or less balanced, focusing a bit more on ATK
-tanky and attacks will break projectiles so you don't have to dodge much, however his swings are pretty slow so getting a Beating Brain is a priority which will make you incredibly resistant to magic/projectiles

In case you choose to play with Mega Swords I suggest working on Scepters and getting items that give both ATK and MAG, while also putting a healthy amount of points in DEF.

Stats:
-HP: 60
-ATK: 0
-DEF: 1
-SPD: 1.70
-MAG: 8
-RES: 2
-ACC: 78%

Skills:
-FIREBALL: 1sec cooldown (3 fireballs, 60% MAG dmg + 20% per level)
-HELL OF FIRE: 6sec cooldown (explosions in a star shape, 100% MAG dmg + 10% per level)
-DUPLICATE: 15sec cooldown (decoy to which you teleport, stun and 5% MAG dmg + 5% per level)





Gameplay Tips:
-level up Hell of Fire once to have an easy start
-get 2 points in accuracy
-max your Fireball as it turns into the most DPS dealing attack
-level up MAG often, but level DEF/RES if needed(depending on area and dodging skill)
-try getting defensive stats from items, but if you are good at dodging or got the item that repels projectiles try getting more MAG instead
-use Hell of Fire to clear corridors you cannot enter, the range of it is unlimited

Stats:
-HP: 40
-ATK: 3
-DEF: 1
-SPD: 2
-MAG: 2
-RES: 1
-ACC: 80%

Skills:
-DAGGER THROW: 0.17sec cooldown (throw a dagger, 100% ATK dmg + 20% per level)
-THIEF BOMB: 8sec cooldown (toss a bomb that deals 130% ATK dmg + 30%, causes several explosions which deal 50% ATK and 100% MAG dmg + 5% and 10% per level)
-INVISIBILITY: 14sec cooldown (invisible and unhittable for 1 second + 1 sec per level)



Gameplay Tips:
-one early point in accuracy
-balance out your bomb and invisiblity
-once you get a few points in invisibility you should focus on your bomb
-focus a lot on ATK and MAG(scepters), rely a lot on dodging and destroying projectiles

UNTESTED

As you read above, this isn't tested but it might function, I've never gotten to try it out. If you find the Bane Scepter, use it to deplete all your HP, but max Invisibility. This way you are permanently unhittable as the cooldown will be shorter than the duration(in theory). As for stats, I suggest getting ATK only, the thief has good Crit Chance and switching between bomb and invisibility might make you die, so just using an incredibly boosted knife throw should work.

The bane scepter:Get 3 stat points and 2 skill points, sacrifice 25% max hp
Health loss is permanent, only regained with health increasing items or leveling up.

Misc:
-you should disable screen shaking
-your attacks will destroy ranged attacks
-pay attention to damage types and stats that you need
-put some points in defenses but remember that HP is a necessity and no defenses will ever be good enough
-always buy items, they're cheap stats(try not to buy the same ones again as the stat boost is lowered)
-don't actually buy boots unless the other items are worse
-keep full stacks of health potions and if possible a crit potion for bosses
-cursed items in most cases aren't worth it

Boss:
-Skeleton King: he has some basic, slow, sphere attacks, he shoots in circle and directed towards the player, he will spawn minions and those should be killed ASAP
-Slime: will jump and upon descent it will shoot projectiles which are easily avoided, I suggest backing off when he starts spraying poison and when you're close to killing it be cautious not to die to the slimelings
-Flying boss: probably the easiest boss, but hardest to reach. He will spawn a wall which can be avoided and broken easily, will spam lasers randomly or in a straight line which deal little damage . He also spawns minions which should be taken out first.
-Guardian: very easy to dodge the straight lasers and orbs, the large orbs will split into smallers fragments so it is recommended to hit at least one them so the fragments don't bounce back to you from the wall.
-Guardian Phase II: will be added upon defeat

Passives:
-get a few points in regen
-try getting some in HP also as it is important
-next, see what you need the most, depending on your playstyle(DEF, MAG, ATK)
-whenever you see cheap upgrades, take them if you can't take anything else
-greed should be left as cheap upgrade or luxury

Hope you enjoyed this Guide, it will probably be updated from time to time as the games gets new content or I learn new things. Bear in mind this is my opinion and the guide is mostly subjective.