Mob Invasions in waves and a Nexus.
Recipe
Throws explosive rocks
Won't float in water. Spreads fire when burning.
Has a charge attack
Jumps a lot. Faster then regular spider
Lays eggs. Eggs hatch mini spiders
Has a flaming attack. Immune to fire.
Has a charge attack. Immune to fire
1 block height. Digs in your base. Crawls horizontally.
Throws TNT
Builds bridges and towers. Can break blocks
Inset it in the Nexus Core and wait for the Invasion