All noncombat skills indirectly influence your performance in combat.
Learning new things. This includes finding out previously unknown information, like the location of town or a hidden door, or uncovering secret knowledge, like a potion recipe or the true name of a demon. Or maybe you just want to know a good place to gather materials like ore or herbs. We will make abilities that let you find things out.
Potion recipe, gathering materials, possibly the name of a demon - helps you out in combat.
Traveling around the world. You will want to improve your movement capabilities (such as sneaking around some ruins), or traveling across the world map faster or more safely, or even teleporting directly to your destination. And sometimes movement requires removing barriers like locks or traps, so you will need some way to unlock and disarm. We'll add abilities for these actions.
Combat stealth and outright avoidance of combat. Locked chests contain things that help you in combat. Traps reduce health, which make you worse at combat, and sometimes they're present in combat situations.
Getting new items. If you are not going to kill a creature to take its things, then we will give you the means to make new items, buy them, or steal them. Or maybe you will choose to support NPC's by bringing them the materials or the recipes needed to make new items for you. We congratulate you on your non-violent and cooperative plans of wealth acquisition, and we'll give you the means to do it.
Items in RPGs are primarily used in combat.
Interacting with companions. Once we have added many interesting and useful NPC companions, we will have to give you ways to recruit them, improve their usefulness, and keep them from dying (or even worse, disliking you!). We will make non-combat abilities that interact with your companions, so you can keep them alive and filled with a grudging respect for you.
Companion-related skills help their performance
in combat.