Brilliant sunlight glistens on the scales of the lizardfolk, highlighting vulnerable spots. Characters gain +1 to hit lizardfolk.
Fist-sized spiders scuttle around the clearing. All creatures grant combat advantage to the spiders.
Errant poison darts in the ground make movement dangerous. Creatures moving 4+ squares save at end of turn or take 3 poison damage.
The squelching soft earth underfoot slows your movement. Creatures suffer a -1 penalty to speed.
A screeching roar in the near distance distracts your opponents. Lizardfolk grant combat advantage.
Shreds of spiderwebs catch on a breeze and flutter around your heads, clinging to your faces. Characters are -1 to hit lizardfolk.
Edit: I forgot one, not sure how I didn't get it included but there it is. It's the last one on the list now.