calcualte monster damage on me?

Squid ink is considered a magic attack, not a physical attack. That might be a little different. We're just talking physical damage here.

I'd like to think that magic attacks (technicality: squid ink is PADamage) use the same calculation as physical damage, since they use the same variable names. And they seem to match up.

i.e. PADamage on squid ink is 145, which is the same as the PADamage of Robo, Blocktopus, Nependeath, etc. which have similar damage output.

As you level up, your "natural defense" goes down, resulting in 6 damage at level 5 becoming 15-16 damage for magicians, 25 for a thief.

Then again that may be the difference between being a beginner versus a magician or thief.

The same formula applies to monster atk/m.atk in every test I've done, there's no reason to believe they're different. I figured out the original formula by estimating from the Crimson Balrog's magic and physical attacks. It's just less common for the m.atk of each spell a monster uses to be listed, most sites only list the monster's matk which is not even linked to an attack in every case.

I just assumed that if no attack value is listed, the monster's attack values "cascade" down.