Tile powers are one time usable, and after used it turns into a normal base tile.
Tile power ups can be used many times, but they have de-buffs to characters who stay on the tile for too long.
And the de-buffs of characters staying too long on a tile will happen only if we go with this approach:
If character stays in the tile for more than one turn - Maximum effect on the 3rd turn:
We can make it more intense and characters can die on 3rd or 4th turn
OR they are stuck in the tile and requires teammates attack to release them (Grass- bound, lava - burning, water - drown)
Overcharge: If character stays on the element buff tile on the second turn (also applies if move to another same element type tile)