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>Eerie terrain
Boosts the power of all grounded pokemon's ghost type attacks by 50%
Prevents healing of any kind for all grounded pokemon (think heal block)
>Slippery terrain
Boosts the power of all grounded pokemon's ice type attacks by 50%
If any grounded pokemon attempts to use a priority move, it trips and falls, negating the move, except if the user were an ice type
>Simple terrain
Boost the power of all grounded pokemon's normal type attacks by 50%
As the field must remain simple and "normal", entry hazards or weather cannot be set for as long as this terrain is active. Hazards previously set remain active and other terrains can replace it, however
>Muddy terrain doubles the power and boosts the accuracy of mud moves (muddy water, mud bomb, mud slap)
>Rocky terrain does damage like an extra layer of spikes but prevents stealth rock, as rocks cannot be sneaky if they're visible all over the battlefield
>Damp terrain prevents burns on anything grounded
>Mysteryous terrain allows dragon type attacks to bypass fairy magic and hit fairy type pokemon
>Hive terrain is full of honey and sticky, doesn't allow any grounded pokemon from leaving once it steps in. Powerful, but as a countermeasure, only the combee line learns it
>Tricky terrain reverts the type effectiveness on grounded pokemon. A truly evil mind breaker for unprepared foes
Dunno you could do almost infinite amounts of these things, some more broken than others tho