Across:
3. green
4. dua
6. icesword
8. war
9. one
10. eel
11. hop
12. kelp
15. evil

Down:
1. jar
2. kingroo
5. airblock
7. whip
13. egg
14. pet

http://www.neopets.com/games/crossword/index.phtml

If you spot any mistakes, please PM a staffer who is online.