Yes. In this case, you initially have 10 strength, and therefore 100 attack. You can invest experience points into strength, but you initially have 1500 experience points, and you need at least 100 experience points to get +1 to a stat (the more you level up, the more you need).
If you're lucky with an artifact, your attack might increase, but the artifact depends on the GM's random selection.
Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.
(Закон сохранения).