Property Goliath has excellent weapon lists for Tyrants and Forge Bosses (and for Bruisers, Specialists and Bullies, who can’t take weapons from the TP anyway). But certainly these fighters may also use any weapon they could imagine from the TP. This opens up a lot of options and players must

Nature domain cleric could be a good preference in the event you’re looking for the slightly different twist with a spiritual druidic fantasy. Clerics also use wisdom for spellcasting and actually gain from firbolgs’ bonuses. Firbolgs receive a +one reward to strength and +2 to wisdom