[core] Clamp lower end of auto attack damage to 0

src/map/attack.cpp

@@ -655,6 +655,15 @@ void CAttack::ProcessDamage()
         m_damage += (int32)(m_damage * ((100 + (m_attacker->getMod(Mod::AUGMENTS_TA))) / 100.0f));
     }
 
+    // low level mobs can get negative fSTR so low they crater their (base weapon damage + fstr) to below 0.
+    // TODO: find out proper fSTR calc for low level mobs when your VIT is ridiculously high. It's likely that this is slightly wrong (possibly you'd get more hits for 0 than you should)
+    // However, there are legitimate strategies on retail with 1 dmg weapons and negative fSTR ranks that result in all auto attacks hitting for 0 but using enspells for damage so no TP is fed.
+    // Absorption isn't possible at this point in the calculation, so zero it.
+    if (m_damage < 0)
+    {
+        m_damage = 0;
+    }
+
     // Try skill up.
     if (m_damage > 0)
     {