Ok, here's a list of bewares I can think of:
- Hydras. They will eat you; use flaming attacks and hope. Or feed them a gazillion zombies. Just beware of their ability.
- Shadow Magic; specifically Okkam's Mindrazor. Dark Elves have high leadership but mostly low strength; when you use this spell they substitute their Leadership for their Strength. Beware S9 Elves!
- Witch Elves. These are just plain nasty, whittle them down before they hit you! [Edit: Made even nastier by Cauldrons of Blood...!]
- Invincible Lord. They can take a nasty Amulet which needs to roll below the strength of the hit to pass the ward-save. So at S3, a 3,2, or 1 will pass. So basically the equivalent of a 4+, and that's only S3 where their armour will be at max. At S4, they pass on a 4-1, so basically a 3+. As soon as you hit S5, where their armour might be compromised a little, they have a 2+ equivalent, only failing on 6s. BEWARE!
- Magic in general; Dark Elf magic can be nasty. Lots of zappy spells, Sacrificial Dagger giving more power to spells, their Signature Spell creating more Power Dice.