Per the helpfile, I don't think it should:
HELP COALESCE
"... All saurians find this process cathartic and as natural as breathing, so they can coalesce even when entirely devoid of mana. But this beneficial method of melding requires time, and saurians are often vulnerable while bonding with their surroundings."


inherent coalesce
You don't have enough mana.

You writhe in agony from the plague.
Your sickness scratches you.