What game engine does Guild Wars 2 use?

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Tags

1. #modifications
2. #developed
3. #include
4. #enhanced
5. #guild
6. #proprietary
7. #modified
8. #physics
9. #heavily
10. #graphics
11. #system
12. #version
13. #animations
14. #havok
15. #environments
16. #arenanet
17. #engine