Raising the Difficulty | Heroes 5.5 Sylvan- S2P1 - Part 1 

With Duriel (it's probably pronounced Duw-Ree-Yell btw) there are some fun tactics that can be used against slow moving neutral armies (that don't have ranged units). You can place a few sprites on the battlefield as single units, and leave the rest of the army behind. Then - now that she has Water Affinity - summon a bunch of water elementals and have the sprites just kite the slower melee units. Simply by waiting and moving twice in a row, the enemy can't get in range to hit the sprite unit(s). The Water Elementals can use up all their castings of Ice Bolt, and then they function as great melee units, since they can win most fights on their own in the early game. The enemy AI used to prioritize attacking the summons, which made this strategy even easier to use in earlier versions of the game. But now you have to attack them yourself with summons, since they just target the unsummoned creatures. This can get you through some fights with no losses, though it's a bit risky when you don't know how many army units the enemy is going to place (too many different stacks makes kiting impossible). The strategy is probably more applicable for people who use reload tactics to try and optimize battles. Regardless, Duriel is a great hero for creeping, so your current game looks like to be off to a good start. Heroic difficulty can be quite challenging and frustrating, so be prepared to have to reload from an earlier save or try again from scratch.

how much more balanced would you say the mod makes the game