[Magiclysm] Add some new high Difficulty spells

[Standing-Storm]

Summary

Mods "[Magiclysm] Add some new high Difficulty spells"

Purpose of change

As title. More spell ideas.

Describe the solution

Add the following spells:

DRUID

• Awakening of the Forest Guardian (Difficulty 10): Allow a tree to pick up its roots and start murdering the enemies of nature. This turns a tree into a treant, an extremely tough though very slow combatant. A single treant can kill dozens of basic zombies, smashing them to a pulp with its branches or squeezing them into paste with its roots, and you had better hope one treant does the job because this spell costs 850 mana to cast. When the treant dies, it turns back into a tree.
• Fountain of the Depths (Difficulty 8): Turn a nearby patch of diggable ground into a spring. When the spell's duration expires, the spring dries up.

I also added treants to the nature spirit list to find in the forests, though they're a very rare spawn.

EARTHSHAPER

• Earth Gate (Difficulty 8): While standing on diggable ground, sink into the earth and reappear from any other patch of diggable ground within the spell's range.

MAGUS

• Adamantine Gaol (Difficulty 10): Imprison the target in an impenetrable barrier, preventing it from moving, attacking, or taking damage for the spell's duration. The spell is expensive but quick to cast, and it does work on allies or on yourself if you want to think tactically about it.

More to come?

Describe alternatives you've considered

Testing

WIP

Additional context

[github-actions]

Spell checker encountered unrecognized words in the in-game text added in this pull request. See below for details.

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• Adamantine Gaol
• Create an impenetrable shell of force around the target, preventing them from moving or acting for the spell's duration. The shell works in two directions and the target is also immune to all harm.\n\nAdamantine Gaol <color_yellow>cannot be dispelled.
• Scroll of Adamantine Gaol
• Scrolls of Adamantine Gaol
• treant
• treants

This alert is automatically generated. You can simply disregard if this is inaccurate, or (optionally) you can also add the new words to tools/spell_checker/dictionary.txt so they will not trigger an alert next time.

Hints for adding a new word to the dictionary

• If the word is normally in all lowercase, such as the noun word or the verb does, add it in its lower-case form; if the word is a proper noun, such as the surname George, add it in its initial-caps form; if the word is an acronym or has special letter case, such as the acronym CDDA or the unit mW, add it by preserving the case of all the letters. A word in the dictionary will also match its initial-caps form (if the word is in all lowercase) and all-uppercase form, so a word should be added to the dictionary in its normal letter case even if used in a different letter case in a sentence.
• For a word to be added to the dictionary, it should either be a real, properly-spelled modern American English word, a foreign loan word (including romanized foreign names), or a foreign or made-up word that is used consistently and commonly enough in the game. Intentional misspelling (including eye dialect) of a word should not be added unless it has become a common terminology in the game, because while someone may have a legitimate use for it, another person may spell it that way accidentally.