Cannot be used as a Synchro Material, except for the Synchro Summon of a Beast-Warrior-Type monster. When this card is Normal Summoned: You can target 1 Level 3 FIRE monster with 200 or less DEF in your Graveyard; Special Summon that target in Defense Position, and if you do, monsters you control cannot attack for the rest of this turn, except Beast-Warrior-Type monsters. You can only use this effect of "Brotherhood of the Fire Fist - Spirit" once per turn.
Brotherhood of the Fire Fist - Spirit is a good Synchro maker for his own archetype, because they are able to bypass all his restrictions. Revive a level-3 Fire Fist monster and use him with Brotherhood of the Fire Fist - Spirit to summon Brotherhood of the Fire Fist - Horse Prince.