With Alchemy, the fourth Defensive War <l:6,66>Advance<e>, Civilizations add primitive chemical weapons to their arsenals and the powerful <l:1,109>Galley<e> dominates the inland seas, while the <l:1,66>Ranger<e> takes stealth warfare to a new level. Building of the Wonder, <l:3,11>Philosopher's Stone<e> may bring free scientific breakthroughs - but only if the Lady Luck smiles.