Is 3D Engine Necessary to a Great Game

A 3D engine is not necessary to a great game, however it may be the most profitable, since 3D engine requires high graphics settings, which result in purchase of a better computer, with good negotiation with the hardware sellers, profit can be made out of the sales of hardware such as graphics card and power supplies.

Many memorable games form the 1990s all did not have 3D engine. What a 3D engine provides is the 3D view as oppose to a 2D view, nothing more than that. So the answer is no and I look forward into seeing more fun games without 3D engine.

Also, making a game with 3D engine as oppose to no 3D engine means tremendously more workload, new coding stuff to learn and harder to modify.

Magic Reduction and Physical Armor

In most games released after 2007 that involved with medieval fantasy stuff had two kinds of attacks: Magical and Physical.

Magical attacks use mana and is usually very burst fire-y.

Physical attacks dont use anything and deals pretty presistant damage, no matter how long the fight has been.

The attacks are different, and so are the defences for them. Magical defence is usually called Reistance or Spell Resistance and most games has the defence set to 10% reduction. In some games, the physical defence is a strict number that subtracts onto the incoming physical damage value, where as in other games it is an inprovable percentage value whether directly or calcualted from an integer number.