Elysium Project Terms of Service:
I. Code of Conduct
C. Gameplay
c ). Safespotting
Safespotting is prohibited under all circumstances. This is the act of engaging in PvP combat while exploiting a position that cannot be reached with basic jumping (no wall-climbing), or engaging enemy players while being in an advantageous position where guards cannot reach you due to pathing, line of sight, or any other game mechanic.
Certain behaviour goes beyond what is considered fair and are considered a violation of this agreement. This behaviour includes, but is not limited to, the following:
Using or exploiting errors in design, features, and/or bugs to gain access that is otherwise not available, to facilitate and/or grant you an advantage over other players.
Engaging players through various world terrain, such as roofs that is otherwise not accessible to gain an advantage.
Intentionally not participating in a battleground.
Official Blizzard Terms of Service (modern WoW though):
IV. World of Warcraft Rules of Conduct
3. Rules Related to Game Play
(1) Using or exploiting errors in design, features which have not been documented, and/or "program bugs" to gain access that is otherwise not available, or to obtain a competitive advantage over other players.
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I think that's pretty much exhaustive.