Strike of the Giants Prerequisite Question

[werescythe]

I interpreted it as having proficiency with all martial weapons, I.E. a fighter, a barbarian, etc.

Yeah, that was my initial thought.

That is quite a good question. It specifically phrases the prerequisite as “Martial Weapon Proficiency”; since “weapon” is singular here, I’d rule as a DM that a character need be proficient in only one martial weapon, so e.g. a 2014 PHB Druid could take it due to scimitar proficiency. As far as I know, that druid and the 2014 Monk are the edgiest edge cases for this, due to granting only a single martial weapon proficiency from their class.

I had wondered that, the reason I kind of bring it up is because I have an idea for a Soul Knife (since Rogues are proficient with rapiers) and combine it with Cloud Strike to have the option to turn invisible (and deal a little extra damage).