Reading it as
A “white heart” is your magic pool.
White heart equals 5 points.
TN 13 to cast.
1 point = 2d 4 effort
2 points = 2d6 effort
3 points = 2d 8 effort
4 points = 2d10 effort
5 points = 2 d12 effort.
TN 13 to save…
Your table your rules….thinking on how I would use this…
To clean it up…1 heart equals 10, double the points used for each effort, probably add some in the middle.
1 point = 1d4
2 point =1d6
3 points = 1d8
4 points = 2d4
And so on-ish
TN should be the room TN. Perhaps a hard roll???
Or perhaps it’s an Item/artifact???
The White Heart Crystal of Skira.
Grants any user the ability to summon a Ray of light so devastating it damages most targets.
Independent of stats a roll of 13 to activate, as the wielder visualizes the target.
If failed roll occurs that many points of HP is removed from the Wielder and inserted into the crystal as impurity.
10 points of impunity chatters the crystal.
The last ray of the days light cleans all impurities or charges a pure crystal.
Crystal acts as a light source, powerful when pure at 10 points, equal to a candle at 1 point of power.
Seems to fit the risk Vs reward most setting have in ICRPG.