If you're under the weakness effect, you cannot destroy end crystals with your fist or holding most items/blocks.

This is very bad in crystal pvp where you're forced to switch to your sword to ignite end crystals. A lot of players think weakness is very annoying as a result of this since you'd have to relearn how to hit end crystals extremely fast.

In crystal pvp sword is the best item to switch to, but any item with more damage than fists works.

Steps to Reproduce:
1. Get yourself under the weakness effect.
2. Place obsidian/bedrock (doesn't matter) and place an end crystal on it.
3. Try to ignite the end crystal with your fist/holding any item/blocks with no extra damage.