Dragon Brain-Eater

A giant brain that climbs onto distracted or asleep dragons. Causes immense pain to hosts and goes through each stage one at a time, only magic or respawning able to go back through stages. Stage 0 — Normal. Stage 1 — Mentally impared. Stage 2 — Primitive. Stage 3 — Animalistic. Stage 4 — Brain-death. Stage 5 — Actual death.