Originally Posted by
Motenten
Saevel -- Think you're using the wrong term for what you mean. All TP scaling (when TP affects damage) is linear, however many weaponskills have discontinuous functions (ie: different between 100-200 TP and between 200-300 TP). There is no "stepped" scaling.
What I've got in the current spreadsheet assumes a reduction in the attack penalty by 7.5% per 100 TP, giving it -20% @100 TP, -12.5% @200 TP, -5% @300 TP (calculations are done on the weaponskill page). I don't remember where I got the -5% from, and yes, it all needs more testing to more properly pin down the numbers.
However even moving it from -12.5% @200 TP to -15% (ie: scale up at 5% per 100 TP instead of 7.5%), that's a difference of getting effectively +7 att instead of +10 for the TP bonus. Overall, the 4 att/25 TP bonus earring is likely worth somewhere between +11 and +14 attack, total.