What engine does Guild Wars 2 use?

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Tags

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