10 - Strip Weapons
Either remove all of the player's weapons, or give them only a hammer.
11 - Beacon
Attach a Bright Light to the player.
12 - Toxic
Kill any enemy players who approach the affected player.
13 - Jets
Give jets to a player, then return them to their previous playertype.
14 - Petting Zoo
Turn the player into a Cow / Horse / Bull / etc.
15 - God Mode
No explanation needed.
16 - Freeze
No explanation needed.
17 - Low Gravity.
If the user jumps, continue their ascent for a bit longer. Fall Damage is reduced, unless the effect ends while the user is in the air.