Blocks Imbued with Potion Effect

Details

• Standing directly on the block immediately provides potion effect for no more than 1 or 2 seconds
• Player (or mob) must continue to stand in place to have sustained effect, but walking over it still briefly applies effect
• No time limit or expiration once activated
• Not as expensive as beacon, with more useful effects

Limitations

• Still quite expensive, nearly end-game stuff
• Like beacon, requires something to get going after placement. It's an installation, not something to bring with you to avoid using potions.
• Effect zone should be centered on block so getting effect from 2 blocks at same time requires good positioning.
• No doubling up effects, even with overlap of beacon or potion usage
• Instant heal and damage don't make sense for this

Usage thoughts

• Race course with haste bonus and slowness traps
• Parkour spots with jump boost or slow falling on ledges
• Combat arena with strength and weakness locations
• Secret entrance behind lava with fire resist effect block underneath
• Lookout spots with night vision
• Would be nice to allow "potion of milk" which would remove all effects
• Even invisibility isn't OP if you must stand still and take off armor.