▁world ▁t ension ▁may ▁be ▁necessary ▁to ▁perform ▁certain ▁actions , ▁like ▁just ifying ▁war ▁against ▁another ▁country . ▁ ▁Exp ans ions ▁and ▁mod s ▁ ▁Exp ans ions ▁ ▁Mod s ▁He arts ▁of ▁Iron ▁IV ▁was ▁developed ▁to ▁be ▁more ▁open - ended ▁than ▁previous ▁games ▁in ▁the ▁series . ▁Part ial ly ▁as ▁a ▁result ▁of ▁this , ▁the ▁game ▁can ▁be ▁more ▁readily ▁mod ded ▁than ▁its ▁prede cess ors . ▁A ▁variety ▁of ▁mod s ▁for ▁the ▁game , ▁most ▁of ▁which ▁can ▁be ▁found ▁on ▁the ▁Ste am ▁Work shop , ▁have ▁been ▁developed , ▁including ▁a ▁number ▁of ▁total ▁conversion ▁mod s ▁that ▁dram atically ▁change ▁the ▁game . ▁Some ▁mod s ▁have ▁been ▁successful ▁enough ▁to ▁attract ▁attention ▁from ▁the ▁media , ▁such ▁as ▁Kaiser reich , ▁a ▁mod ▁set ▁in ▁a ▁world ▁where ▁the ▁Central ▁Pow ers ▁won ▁World ▁War ▁One , ▁Red ▁World , ▁a ▁mod ▁set ▁in ▁a ▁world ▁where ▁the ▁Soviet ▁Union ▁won ▁the ▁Cold ▁War , ▁Mill en ni um ▁Da wn , ▁a ▁mod ▁set ▁in ▁the ▁modern ▁day , ▁and ▁The ▁Great ▁War , ▁a ▁mod ▁set ▁in ▁the ▁First ▁World ▁War . ▁Some ▁mod s ▁have ▁also ▁attract ed ▁controvers y ▁for ▁rac ist ▁and ▁fasc ist ▁over ton es , ▁such ▁as ▁De us ▁V ult , ▁a ▁mod ▁that ▁adds ▁the ▁Kn ights ▁Tem pl ar ▁( which ▁includes ▁an ach ron istic ▁figures ▁such ▁as ▁Jesus ▁Christ ▁and ▁Adolf ▁Hitler ) ▁to ▁the