Mustrum_Ridcully
Legend
It is indeed a class feature and it may help, but it seems rather underwhelming to me, but maybe I am expecting a high level caster to cast more spells then he actually will be able to. 3E had you casting at least 20 at level 7 (0-4 spell levels, 4 slots each) or so, if a D&D Next caster at that level can cast 7 spells and the Fighter can Surge 7/day, it may be close. Of course, depend also what the caster can actually cast (A Disintegrate is a lot powerful than a single extra action)."Fighter's Surge" is a class feature, not derived from the slayer theme. 2nd level abilities all appear to be class features in the playtest characters.