In section “adjustments”, change

.Spend 50 Mana: Remove two Basic Effects with the same Stat on a single Die, and add a new Basic Effect to the same Die whose Value is the sum of the Values of the two Basic Effects just removed to the same Die

To

.Spend 50 Mana: Remove two Basic Effects with the any Stat on a single Die. If they are the same Stat, then
add a new Basic Effect to the same Die whose Value is the sum of the Values of the two Basic Effects just removed to the same Die. If they were different Stats, then add a new Mutable Effect to the same Die whose Value is the is the disjointed sum of the Values of the two Basic Effects just removed to the same Die.

And in section “Dice”, change

An effect listed as “X Stat” (where “X” is a number and “Stat” is an aspect of an Island) means increasing the named aspect of the Island taking the action, by the amount X. (If X is a negative number, this will result in the aspect being decreased, to a minimum of zero.) Such an effect is known as a Basic Effect. The Value of an Basic Effect is the value corresponding to X, and the Stat of a basic effect is the named Aspect.

To

An effect listed as “X Stat” (where “X” is a number and “Stat” is an aspect of an Island) means increasing the named aspect of the Island taking the action, by the amount X. (If X is a negative number, this will result in the aspect being decreased, to a minimum of zero.) Such an effect is known as a Basic Effect or Mutable Effect. The Value of an Basic Effect is the value corresponding to X, and the Stat of a basic effect is the named Aspect. Mutable Effect is a the disjointed sum of 2 or Basic Effects.