Rune Magic

I returned to idea of Rune Magic in the way it’s possible with VCMI.

The idea is that base set of runes is made (scandinavian, or some fictious, in form of DEFs/png to be used as artefacts). It’s about 20-40 runes look like grey stones with engravement.
They have no abilities and to be placed to misc slots (5 slots):

"art660":
	{
		"type": "HERO"],
		"slot" : "MISC",
		"class": "TREASURE",
		"value":3000,	
		"text":
		{
			"name": "Rune of Human",
			"description": "Gives nothing.",
			"event": ""
		},
		"graphics":
		{
			"image": "hero_arts/660_.bmp",
			"map": "hero_arts/660.def"
		},
		"bonuses":
		
			{
"type": "NONE"
			}
		]
	},

Then we use component artefacts and thing that our base runes have no abilities to be inherited.
There is exaple of second level rune (they can be made to look like stones of golden color, for example, and some light from them). They take 2 slots and give some bonuses.

"art671":
	{
		"type": "HERO"],
		"slot" : "MISC",
		"class": "TREASURE",
		"value":6000,	
"components":

"art660",
"art670"
],

		"text":
		{
			"name": "Activated Rune of Human",
			"description": "Gives +2 defence and +10% to Armorer skill.",
			"event": ""
		},
		"graphics":
		{
			"image": "hero_arts/671_.bmp",
			"map": "hero_arts/671.def"
		},
		"bonuses":
		
			{
"type": "PRIMARY_SKILL",
"subtype":1,
"val":2
			},
{
"type":"SECONDARY_SKILL_PREMY",
"subtype":"skill.armorer",
"val":10
}
		]
	},	

These component arts can be made to use unique runes combinations to give different bonuses.
There can be also 30-40 rune sets consist of 2 pieces.

Than other levels (3-5 pieces rune collections) can be made to give greater bonuses (with different look).
If we need other bonus, we decompose current rune set to ordinary runes and compile another run set to get another unique bonuses.

What do you think of this?

Really minor problem from math side:
Assuming just ten 1-level runes and high-level runes composed from every possible combination gives you:
45 2-level runes
120 3-level runes
210 4-level runes
252 5-level runes
Ouch.

And with 20 base runes you’ll get 15k of 5-level runes. Ouch ouch.

Level 1,2,3,4,5 runes will be all the same (same engravings), so it limits all of them to base quanitity of runes.
Of cause no one can draw 252 5-level runes:-)
It will be no all possible combinations, but just legal combinations coming from runes meaning.
Like rune ‘Hagalaz’ (destruction, death) combined with ‘Mannaz’ (human), will do some destructions to enemy units.
Really it will be good to use scandinavian runes only, cause there are already some rune combinations in our world said to do some magic.