Introduction

General

Pax Dei will sport an action based combat system that aims to be more strategic than reactive, so the decisions you make before combat (gearing up, knowing the weaknesses etc) are at least as important than the ones you make during combat. It won't be hotkey smashing and not super timing sensitive either as the goal is to make anticipation and reading the encounter more important than reaction speeds but there will be room for mastery.

Targeting system

There won't be tab-targeting. Combat will be action based and you chose the direction of your attacks. 

As for spell-casting, here's a quote from the developer:

...we will offer different types of targeting, not just AoE, so yes you will be able to decide who to heal...

Melee attacks

There will be attacks allowing you to swing melee weapons where directional combat is the main rule. Weapons are confirmed to have different attack rates and damage based on their weight/size, which is supposed to be part of the main strategy in combat.

Ranged attacks

Ranged attacks will be available. As for bow shots, they will need to be charged and physics will play a role on how the arrows perform.

Other attacks

Other abilities have been mentioned to be available, most likely magic based.

Stamina

Stamina is the "main currency" in combat. Most actions and abilities will use stamina. Running out of stamina will have meaningful (but not frustrating) consequences, which may be dire though. The system is said to allow some "leeway" in that regard though.