The word locus (plural loci) is Latin for "place".
In biology, a locus is the position of a gene (or other significant sequence) on a chromosome. A locus can be occupied by any of the alleles of the gene. Diploid or polyploid cells are either homozygous (have the same allele at a locus) or heterozygous (have different alleles at a locus).
In mathematics, a locus is the set of points satisfying a particular condition. It is mostly used when the set of points forms a curve of some sort (see locus (mathematics)).
In the classics, literature or theology, locus (or locus classicus) marks the first appearance of a phrase or the definitive passage that is authoritative for an idea.
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Loci theologici or loci communes, are the common topics of discussion in theology.
The greatest work of this kind is "Loci communes theologici", by John Gerard, professor at Jena, published in nine volumes (1610-1622); it is the greatest and also the last.
They are: the authority of Holy Scripture, of Catholic tradition, of general councils, of the Roman Church, of the Fathers, of the Schoolmen; natural reason, the authority of philosophers and doctors in civil law, and the authority of history.
Once a genius loci animates a portion of itself to attack the boundaries of its form become clear, and the creature becomes open to attack (Survival checks to determine the extent of the genius loci are no longer necessary).
If the genius loci hits a Gargantuan or smaller creature with a slam attack, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity.
The genius loci has the option to conduct the grapple normally, or simply use the part of its body it used in the improved grab to hold the opponent.