Change the category of the Spike materials (from the 0* Minute Mysterious Spikes to the 5* Huge Mysterious Spikes) to appear either under the Rarity or Tokens section, rather than under the Material section alongside the other hundred different materials, since it would make it easier to locate them.

In my opinion, this should also be done for the other event materials such as the Ancient Shell and the Fiendish Glyphs (Tortodrone Event materials).

Apocrean Sigils and Ancient Pages (Black Kat Event material) already appear under the tokens section. Meanwhile, Golden Slime Coins (Slime Casino Event material) appear under the Rarity section.

As for deciding choosing between the Rarity or Tokens category for the Spike materials, I prefer Rarity since they don't have token-shaped icons, and also because they range from 0* to 5* like Orbs and Fire Crystals.