builder vs beast

 Balance update after our first real games, where a fully upgraded Beast broke a level 10 door in seconds. Every player
  needs this version to join a server running it.

  The Beast
  - Claws now max out at level 15 (was 16).
  - Nest monsters no longer earn gold for the Beast. Mini Beasts still do.

  Defenses
  - Archers shoot 3 arrows per volley: the Beast first, then the closest monsters. They no longer stay locked on a
  single monster.
  - Archer damage now grows ×10 per level above level 5.
  - New arrow rain: each archer calls one every minute on the Beast or on the biggest group of monsters. It lasts 5
  seconds over a 5-block radius, and rains from several archers stack.
  - Frost shooters now aim at monsters too. Their snowballs burst over 4 × 4 blocks and slow down movement and attack
  speed.
  - The healer heals with a beam instead of particles, and keeps healing while the door is under attack.
  - Arrows and snowballs are drawn by each player's game: far less network traffic in big fights.

  Underground mine
  - No more furnaces: ore drops its ingot directly (iron, gold, netherite; diamonds as before).
  - Diamond and netherite pickaxes mine ancient debris 4 times faster.

  Fixes
  - Roof stairs leave 3 blocks of headroom, so you no longer bump your head.