Mixing two martial classes together is generally a pretty safe proposition from a mechanical standpoint. The berserker class is more all-in on physical ability scores than the herald is, but focusing on Strength and Charisma and picking the heavy armor defense option for the berserker is almost certain to give you good results. The flavor mix is no great stretch, either; fiery tempers and strong convictions clearly go together, and it’s not hard to envision a character with both. There are numerous natural archetype pairings with overlapping or complementary tropes. Players wanting to shore this complementary flavor up even more are encouraged to look at the new berserker developed talents in *Venture Forth* from Speaks and Spells publishing; a number of them are especially fitting for this pairing. Regardless of the mix of levels, this is probably going to play pretty similarly; the character is going to want to get right up on top of their enemies and pound on them in melee combat, and they will have the armor class, hit points, and damage output to excel in that situation. [[Synergy Feats for Multiclassers#Berserker w/ Herald|Berserker-Herald chains and ideas]]