lol?...Search for Item ability called "Item Permanent Damage Gain"
it exist, do not use the Claws Attack increase abilities,
the ability "Item Permanent Damage Gain" has the icon of tome of power, search for it,
its base value is 3, hope you found it.
Place the ability later on at any rune. or tomes.
it works for any powerups.
for defense,Mspd,Etc, i used the "Glyph of fortification" upgrade ability, it stacks.
so , giving it to the hero multiple time, increase the upgrade level. by 1.
you don't have to rep anyways, i am not the Species that eats reps ;D