Design pillars

Dark Omen pillars 

1. Immersive battles
   slow-paced, focus on tactical maneuvering and micro-management of moderate-sized troops rather than grand armies confrontation, button mashing power-ups (e.g. strength boost)
   
   
2. Tabletop rules adherence (which emphasizes medieval warfare simulation)
   combined arms, formations, flanking, line of sight, terrain advantage, troops morale, etc
   
   
3. High fantasy setting 
   mythic races, terrifying monsters and powerful sorcery

It is porbably worth to mention engaging storyline which is present in Dark Omen single-player game mode. 

scope prioritization by using pillars and Venn diagramm: