Epirus lost most of its importance after Pyrrhus's death in 272 BC (and the fact that EB starts at this date has already been mentioned). The only major event after that coincides with the EB timeline was Alexander II of Epirus (Pyrrhus's son) invasion of Macedonia, which he lost later on along with his own throne. He was restored later and just ruled his kingdom until his death in 260. The Epirote monarchy was deposed in the 230's.
The Illyrians like mentioned before were never really unified. One of the largest and most important tribes, the Taulanti (Southern Illyria between Epidamus and the Vjosa River), were already incorporated into Epirus due to Pyrrhus's expansions before the start of this mod.
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