I tried it with "GetAbilityInfoByIndex(AbilityID)" to get the current level of "Swiftly Forgotten" ... but with the AbilityID 76454 (or 76455, 76456, 76457) the return is null ... even though I've learned that.
Code:
local s_name, s_texture, n_rank, n_actionSlotType, b_passive, b_showInSpellbook = GetAbilityInfoByIndex(76454)
I've got the AbilityID's from this site