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Almost all heroes can do this; it largely depends on the game and the situation, but Letos, Iranna, and Waishan are very good (I play version 1.6). It's especially convenient if Iranna and Waishan appear at the start; their troops can be combined into one hero, and then you're ready to go:smile19:
1. Waishan - scouts, luck, quick access to "Lucky Charm"
2. Iranna - furies(!), education with "Mana Attraction"
3. Letos - special ability (level 20 - 50% chance to poison any enemy unit on the battlefield), Darkness(?), depends on the neutral creatures and luck
4. Sinithar - archer from the start; initially, mana saving helps; good on fast maps, but then he fades somewhat.
5. Erin - attack and Chaos; the ability depends heavily on chance.
6. Kifrah - leadership; if "Empathy" were in version 1.6, she would be more worthwhile.
7 and 8 - Irbeth and Sorgal - weak; the first loses to Letos, and the second's ability is practically useless.
1. Waishan - scouts, luck, quick access to "Lucky Charm"
2. Iranna - furies(!), education with "Mana Attraction"
3. Letos - special ability (level 20 - 50% chance to poison any enemy unit on the battlefield), Darkness(?), depends on the neutral creatures and luck
4. Sinithar - archer from the start; initially, mana saving helps; good on fast maps, but then he fades somewhat.
5. Erin - attack and Chaos; the ability depends heavily on chance.
6. Kifrah - leadership; if "Empathy" were in version 1.6, she would be more worthwhile.
7 and 8 - Irbeth and Sorgal - weak; the first loses to Letos, and the second's ability is practically useless.