Create a standard pool of tile effects for Worldspeaker's Guide

[alice-i-cecile]

Reuse in affixes

[alice-i-cecile]

• ice
• grease
• fire
• lava
• thorns
• destructible terrain
• shallow water
• caltrops
• lucky ground (name?? advantage on all attacks)
• webs
• taboo ground (name?? applies frightened)

[alice-i-cecile]

• anti-teleportation field
• updraft (everyone is aloft)
• transport belts
• portals
• soft ground (prevents fall damage)